:
If you link us to a schematic, we might be able to give you more specific info.
:
:If you link us to a schematic, we might be able to give you more specific info.
:
Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
Lewis
::
::If you link us to a schematic, we might be able to give you more specific info.
::
:
:
:Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
:Lewis
:
here is a link to the schematic...
TKS..
:::
:::If you link us to a schematic, we might be able to give you more specific info.
:::
::
::
:
::Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
::Lewis
::
:here is a link to the schematic...
:TKS..
:
:http://i1253.photobucket.com/albums/hh583/micro-9/HoffmanMW601.jpg
::::
::::If you link us to a schematic, we might be able to give you more specific info.
::::
:::
:::
::
:::Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
:::Lewis
:::
::here is a link to the schematic...
::TKS..
::
::http://i1253.photobucket.com/albums/hh583/micro-9/HoffmanMW601.jpg
:
Radio IF peaked up to 455khz..The RG is off and I am unable to adjust it down the band...550 comes in @ 850 and of course 1600 is off the band..any ideas?
TKS..
There should be trimmer caps on the tuner. Adjust them at high end of the band. Oscillator trimmer will move stations on the dial while antenna section peaks them.
Are you sure the IF frequency is corrent? With stations compressed on the dial it seems set way high. A signal generator may be further off than the radio unless frequency counter is connected.
If you don't have equipment I would tighten screws in IF Transformers about 1/2 turn and then peak up signals. This will separate stations. You may need to do this several times? This takes practice but can be done without equipment.
Norm
:::::Does the radio work? Do the stations come in about where they should on the tuning dial? If Yes, tune to a weak station, and slowly adjust the two IF transformers for maximum volume. You're done.
:::::
:::::If you link us to a schematic, we might be able to give you more specific info.
:::::
::::
::::
:
:::
::::Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
::::Lewis
::::
:::here is a link to the schematic...
:::TKS..
:::
:::http://i1253.photobucket.com/albums/hh583/micro-9/HoffmanMW601.jpg
::
:
:Radio IF peaked up to 455khz..The RG is off and I am unable to adjust it down the band...550 comes in @ 850 and of course 1600 is off the band..any ideas?
:TKS..
:
|
:::: ::::here is a link to the schematic...
:Hi
:
: There should be trimmer caps on the tuner. Adjust them at high end of the band. Oscillator trimmer will move stations on the dial while antenna section peaks them.
:
: Are you sure the IF frequency is corrent? With stations compressed on the dial it seems set way high. A signal generator may be further off than the radio unless frequency counter is connected.
:
: If you don't have equipment I would tighten screws in IF Transformers about 1/2 turn and then peak up signals. This will separate stations. You may need to do this several times? This takes practice but can be done without equipment.
:
:Norm
:
:
:
::::::Does the radio work? Do the stations come in about where they should on the tuning dial? If Yes, tune to a weak station, and slowly adjust the two IF transformers for maximum volume. You're done.
::::::
::::::If you link us to a schematic, we might be able to give you more specific info.
::::::
:::::
:::::
::
:::::Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
:::::Lewis
:::::
::::TKS..
::::
::::http://i1253.photobucket.com/albums/hh583/micro-9/HoffmanMW601.jpg
:::
::
::Radio IF peaked up to 455khz..The RG is off and I am unable to adjust it down the band...550 comes in @ 850 and of course 1600 is off the band..any ideas?
::TKS..
::
:
:
|
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Micro 9. . . . . Calling Micro 9 . . . Come in pls . . .
:
:
:Mini 1 here . . . . .
:
:
:I have done an initial mark up of your reference schematic . . . . . pointing out what SHOULD be the mystically magic adjustment . . . in the respect of the prior suggestion . . . . by the Right Honourable and Esteemed Norman Leal . . . . (Esq.)
:
:
:How's about running thru some exploratory adjustment procedures and then feed back , what your findings are to us .
:
:
:First run the dial indicator down to the low end of the dial and then to the high end of the dial and confirm that the mechanical end limits are both reached, or seem to balance out equally in error or extreme range limits . . . . ERGO that your dial stringing and / or dial pointer are within prescribable MECHANICAL limits.
:
:
:Then if you actually do have a station operating on that "550" referenced to . . . or else choose a well RECEIVABLE station on the low end of the dial as being our working reference station, instead.
:
:
:Considering that we are NOW receiving the 550 station, tune into it initially and then tune off to its side on the LOW frequency side direction of the received station until you start not being able to hear it any longer.
:
:
:Stop at that point and use the C6 trimmer capacitor that is paired with and associated with the smaller vaned portion of the tuning condensers oscillator section.
:
:
:Slightly tightening its adjustment, and thereby compressing its plates, should then give you a bit more capacitance and skew the oscillators frequency into a lowered frequency.
:
:
:That should then permit you to correct for the purposeful shifting of the initially detuned condition that you created down at the lower side, such that the station is NOW coming clearly, but yet, now being at an ever so slightly lower positioning DOWN on the dial scale. (Dat's what we's a lookin' fer ! ! ! ! )
:
:
:Do that tuning of the dial to the left of the station, and then correct to get "right on " reception with the C6 adjustment, multiple times . . . . . til the trimmer is max compressed on its plates and then no longer adjustable.
:
:
:This being in order to see JUST HOW close we can get in "walking" the inital 850 dial scale reading , on DOWNWARDS and ever closer to that required " 550 " reading of the tuned in reference station on the dial scale.( Which was initially, and erroneously coming in at " 850 " marking on the dial scale.
:
:
:AND then . . . . . AND THEN . . . .you might go back to the initially approximate setting of C6 osc tracking trimmer and start
:" walking " that " 550 " reference station UP the dial scale to see how far it can be moved up the dial scale, before the C5 trimmer is then fully opened up and void of any further range shift.
:
:
:Basically "WE WANTS TO KNOWS" . . . a la Dirty Harry . . . prezactly HOW much oscillator frequency range shift you are experiencing within C6's adjustments LIMITS ranges.
:
:
:Now I don't think that there can be a second harmonic possibility of the oscillator . . . but at about the max closed position of C6, tune down around the bottom of the dial scale and see if " 550 " might have mysteriously popped in and is now being to closer to its required place.
:
:
:
:
:
:NOW . . . . Reference (mildly marked up) . . . . ACH HIMMEL . . . icht bin der Hoffmeister MW601 Schema:
:
:
:
:
:
:
:
:
:
:73's de Edd
:
:
:
:
: Cats regard people as warm-blooded furniture.
:
:
:
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:
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:
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:
:
:
:
::Hi
::
:: There should be trimmer caps on the tuner. Adjust them at high end of the band. Oscillator trimmer will move stations on the dial while antenna section peaks them.
::
:: Are you sure the IF frequency is corrent? With stations compressed on the dial it seems set way high. A signal generator may be further off than the radio unless frequency counter is connected.
::
:: If you don't have equipment I would tighten screws in IF Transformers about 1/2 turn and then peak up signals. This will separate stations. You may need to do this several times? This takes practice but can be done without equipment.
::
::Norm
::
::
:
::
:::::::Does the radio work? Do the stations come in about where they should on the tuning dial? If Yes, tune to a weak station, and slowly adjust the two IF transformers for maximum volume. You're done.
:::::::
:::::::If you link us to a schematic, we might be able to give you more specific info.
:::::::
::::::
::::::
:::
:
:::::
::::::Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
::::::Lewis
::::::
:
:
:
:::::here is a link to the schematic...
:::::TKS..
:::::
:::::http://i1253.photobucket.com/albums/hh583/micro-9/HoffmanMW601.jpg
::::
:::
:::Radio IF peaked up to 455khz..The RG is off and I am unable to adjust it down the band...550 comes in @ 850 and of course 1600 is off the band..any ideas?
:::TKS..
:::
::
::
:
:
:
: : : : : : : : : : : :Addenda: . . . . . : : :oopsies . . . . . . to Lewis . . . PERDON MOI . . . . . : : : : I have done an initial mark up of your reference schematic . . . . . pointing out what SHOULD be the mystically magic adjustment . . . in the respect of the prior suggestion . . . . by the Right Honourable and Esteemed Norman Leal . . . . (Esq.) : : : : :Lewis Linson . . . . AKA . . . .LOUIE LOUIE . . . (a la The Kingsmen ) . . . . . SEZ . . . . me too . . . ME TOO ! : My Esteemed Sir Edd: You should use the verb ending "ez" for the second person plural (I know I am singular, but if yoused the first person singular, it would translate to "thee", indicating we were more than just friends), so "pardoner", meaning "to pardon" would become "Pardonnez-moi". Now, a funny thing about "Louie, Louie", that so called song came out when I was the Chief Engineer of the last radio station I ran before defecting to AT&T. Parents were trying to have the song banned from the airways, as they couldn't understand the words, so I had a copy of the lyrics and won a few beers with that knowlege. My wife, whom I wouldn't meet for about twenty years, and a girl friend were out one night at a place where the Kingsmen were performing, and the friend lost her keys, and they were nice enough to "hot wire" her car so they could get home. She rembers them as nice, funny guys. That Hoffman radio, with its RF amp, has almost the same schematic as the Stromberg-Carlson I am rebuilding, except mine had a selenium rectifer and a Glo-Bar resistor, plus a 50L6 output tube. I hope to have the audio section working by tonight, a few resistors also got their values changed from the lightning strike that exploded the Glo-Bar, which I haven obtained yet, but the filament current is just about perfect at 100 Volts AC. The 7001 is still displaying time and date, it is now 4:29:30 on July 15 here on the East side of Atlanta. Lewis : : : :> > > < < < : : : : : : : : : :73's de Edd : : : : : Its true, I am an insomniac, but I don't lose any sleep over it ! : : : : : : : |
:
:
:
:
:
:
::
::
::
:: :: :: :: :: :: :: :: :: :: :: ::Sir Micro 9. . . . . Calling Micro 9 . . . Come in pls . . . :: :: ::Mini 1 here . . . . . :: :: ::I have done an initial mark up of your reference schematic . . . . . pointing out what SHOULD be the mystically magic adjustment . . . in the respect of the prior suggestion . . . . by the Right Honourable and Esteemed Norman Leal . . . . (Esq.) :: :: ::How's about running thru some exploratory adjustment procedures and then feed back , what your findings are to us . :: :: ::First run the dial indicator down to the low end of the dial and then to the high end of the dial and confirm that the mechanical end limits are both reached, or seem to balance out equally in error or extreme range limits . . . . ERGO that your dial stringing and / or dial pointer are within prescribable MECHANICAL limits. :: :: ::Then if you actually do have a station operating on that "550" referenced to . . . or else choose a well RECEIVABLE station on the low end of the dial as being our working reference station, instead. :: :: ::Considering that we are NOW receiving the 550 station, tune into it initially and then tune off to its side on the LOW frequency side direction of the received station until you start not being able to hear it any longer. :: :: ::Stop at that point and use the C6 trimmer capacitor that is paired with and associated with the smaller vaned portion of the tuning condensers oscillator section. :: :: ::Slightly tightening its adjustment, and thereby compressing its plates, should then give you a bit more capacitance and skew the oscillators frequency into a lowered frequency. :: :: ::That should then permit you to correct for the purposeful shifting of the initially detuned condition that you created down at the lower side, such that the station is NOW coming clearly, but yet, now being at an ever so slightly lower positioning DOWN on the dial scale. (Dat's what we's a lookin' fer ! ! ! ! ) :: :: ::Do that tuning of the dial to the left of the station, and then correct to get "right on " reception with the C6 adjustment, multiple times . . . . . til the trimmer is max compressed on its plates and then no longer adjustable. :: :: ::This being in order to see JUST HOW close we can get in "walking" the inital 850 dial scale reading , on DOWNWARDS and ever closer to that required " 550 " reading of the tuned in reference station on the dial scale.( Which was initially, and erroneously coming in at " 850 " marking on the dial scale. :: :: ::AND then . . . . . AND THEN . . . .you might go back to the initially approximate setting of C6 osc tracking trimmer and start ::" walking " that " 550 " reference station UP the dial scale to see how far it can be moved up the dial scale, before the C5 trimmer is then fully opened up and void of any further range shift. :: :: ::Basically "WE WANTS TO KNOWS" . . . a la Dirty Harry . . . prezactly HOW much oscillator frequency range shift you are experiencing within C6's adjustments LIMITS ranges. :: :: ::Now I don't think that there can be a second harmonic possibility of the oscillator . . . but at about the max closed position of C6, tune down around the bottom of the dial scale and see if " 550 " might have mysteriously popped in and is now being to closer to its required place. :: :: :: :: :: ::NOW . . . . Reference (mildly marked up) . . . . ACH HIMMEL . . . icht bin der Hoffmeister MW601 Schema: :: :: :: :: :: :: :: :: :: ::73's de Edd :: :: :: :: :: Cats regard people as warm-blooded furniture. :: :: :: :: :: :: :: |
::
::
::
::
::
::
:::Hi
:::
::: There should be trimmer caps on the tuner. Adjust them at high end of the band. Oscillator trimmer will move stations on the dial while antenna section peaks them.
:::
::: Are you sure the IF frequency is corrent? With stations compressed on the dial it seems set way high. A signal generator may be further off than the radio unless frequency counter is connected.
:::
::: If you don't have equipment I would tighten screws in IF Transformers about 1/2 turn and then peak up signals. This will separate stations. You may need to do this several times? This takes practice but can be done without equipment.
:::
:::Norm
:::
:::
::
:::
::::::::Does the radio work? Do the stations come in about where they should on the tuning dial? If Yes, tune to a weak station, and slowly adjust the two IF transformers for maximum volume. You're done.
::::::::
::::::::If you link us to a schematic, we might be able to give you more specific info.
::::::::
:::::::
:::::::
::::
::
::::::
:::::::Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
:::::::Lewis
:::::::
::
::
::
::::::here is a link to the schematic...
::::::TKS..
::::::
::::::http://i1253.photobucket.com/albums/hh583/micro-9/HoffmanMW601.jpg
:::::
::::
::::Radio IF peaked up to 455khz..The RG is off and I am unable to adjust it down the band...550 comes in @ 850 and of course 1600 is off the band..any ideas?
::::TKS..
::::
:::
:::
::
::
:
:
I set the IF cans down to 2 turns and started from scratch...The radio comes in where it should after a complete alignment
The IF was WAY-Off...TKS Again...
:Hi
:
: There should be trimmer caps on the tuner. Adjust them at high end of the band. Oscillator trimmer will move stations on the dial while antenna section peaks them.
:
: Are you sure the IF frequency is corrent? With stations compressed on the dial it seems set way high. A signal generator may be further off than the radio unless frequency counter is connected.
:
: If you don't have equipment I would tighten screws in IF Transformers about 1/2 turn and then peak up signals. This will separate stations. You may need to do this several times? This takes practice but can be done without equipment.
:
:Norm
:
:
:
::::::Does the radio work? Do the stations come in about where they should on the tuning dial? If Yes, tune to a weak station, and slowly adjust the two IF transformers for maximum volume. You're done.
::::::
::::::If you link us to a schematic, we might be able to give you more specific info.
::::::
:::::
:::::
::
::::
:::::Without a schematic, I am assuming a lot here, but there should be two trimmer adjustments on the tuning capacitor. One will get the stations to line up with the dial numbers, the other will peak for best sensitivity, both have the most effect at the high end of the dial. If the radio hasn't been "fixed" before by a tweaker, you shouldn't have to move anything very much for best sensitivity.
:::::Lewis
:::::
::::here is a link to the schematic...
::::TKS..
::::
::::http://i1253.photobucket.com/albums/hh583/micro-9/HoffmanMW601.jpg
:::
::
::Radio IF peaked up to 455khz..The RG is off and I am unable to adjust it down the band...550 comes in @ 850 and of course 1600 is off the band..any ideas?
::TKS..
::
:
:
:I set the IF cans down to 2 turns and started from scratch...The radio comes in where it should after a complete alignment
:The IF was WAY-Off...TKS Again...
:
Hi.. I'm glad it worked out and you've got it running fine again.
I read the part where Norm suggested you reset the IF trimmers and I see here that you indicated that was what you did.
I was looking at the schematic and I see that this radio uses slug-tuned IFs .. so there aren't any screws to turn for the IF caps adjustment.
So unless your actual radio uses the more conventional capacitor-tuned type of IF can.. I was wondering how you would have been able to "turn down 2 turns" on each can unless you meant that you adjusted the slugs down two turns.
Which was it?
::I set the IF cans down to 2 turns and started from scratch...The radio comes in where it should after a complete alignment
::The IF was WAY-Off...TKS Again...
::
:Hi.. I'm glad it worked out and you've got it running fine again.
:
:I read the part where Norm suggested you reset the IF trimmers and I see here that you indicated that was what you did.
:I was looking at the schematic and I see that this radio uses slug-tuned IFs .. so there aren't any screws to turn for the IF caps adjustment.
:So unless your actual radio uses the more conventional capacitor-tuned type of IF can.. I was wondering how you would have been able to "turn down 2 turns" on each can unless you meant that you adjusted the slugs down two turns.
:Which was it?
:
:
These IF cans have a single screw on the top and bottom of the cans..Pri-Sec..I screwed them down till they stopped and the adjusted to 2 turns up for a start point...Injected a 455 KHZ signal and a fan meter(Analog VOM) on the output and adjusted for peak...
:
You say " one screw" on top.
... do you mean an actual metal screw-head?. .. or is it a slot in a ferrite-slug that is set down in a hole?
If it is a ferrite slug.. then there should also be a 2nd slug that is accessible from below as well.
One for primary the other is the 2ndary.
::
:You say " one screw" on top.
:... do you mean an actual metal screw-head?. .. or is it a slot in a ferrite-slug that is set down in a hole?
:
:If it is a ferrite slug.. then there should also be a 2nd slug that is accessible from below as well.
:One for primary the other is the 2ndary.
:
:
Metal screw head on the top and bottom..
:::
::You say " one screw" on top.
::... do you mean an actual metal screw-head?. .. or is it a slot in a ferrite-slug that is set down in a hole?
::
::If it is a ferrite slug.. then there should also be a 2nd slug that is accessible from below as well.
::One for primary the other is the 2ndary.
::
::
:Metal screw head on the top and bottom..
:
Interesting. Thanks.
Somehow that screw must have a threaded shaft that moves the ferrite slugs in and out of the winding.
I think what he is trying to explain is shown in a picture on the following link (the top picture, click on it for larger view). A ferrite slug molded onto the end of a threaded screw (bronze??.
http://www.hanssummers.com/ift.html
Clifton
:::
::::
:::You say " one screw" on top.
:::... do you mean an actual metal screw-head?. .. or is it a slot in a ferrite-slug that is set down in a hole?
:::
:::If it is a ferrite slug.. then there should also be a 2nd slug that is accessible from below as well.
:::One for primary the other is the 2ndary.
:::
:::
::Metal screw head on the top and bottom..
::
:Interesting. Thanks.
:Somehow that screw must have a threaded shaft that moves the ferrite slugs in and out of the winding.
:
:
:
:I think what he is trying to explain is shown in a picture on the following link (the top picture, click on it for larger view). A ferrite slug molded onto the end of a threaded screw (bronze??.
:
:http://www.hanssummers.com/ift.html
:
:Clifton
:
Thanks... yes, that was what I thought it should have been... a brass threaded screw with a slot in the top.
But I thought he said it had a "screw-head" on it.. which I haven't seen before.