Check all wiring thoroughly and slowly. Check all capacitor values. Check all resistor values and resistances to be sure that you didn't do something like reverse colors and install an incorrect value resistor.
...And, of course, check tubes for shorts and gas and other faults. Be sure to perform an element to element shorts test.
A few months ago I restored an Airline 14WG-806A. This radio was terrible. Someone kept it in a barn or something. The cabinet was fairly bad, and the chassis was badly rusted and covered with mouse/chicken excrements. The rubber wiring was badly decayed, so I decided to gut the entire chassis down to just the tube sockets. After cleaning away most of the rust, and painting the chassis (something I don't normally do), I rewired using cloth push-back wire. The output transformer, which is for push-pull, has a blue, red, and orange set of primary wires. Now, normally blue is plate and red is B+, but for whatever reason I assumed that the blue wire was black or something (also, this radio does not use conventional wire color-coding; B+ is blue throughout the radio except for the output transformer and the eye socket....red is for filament wiring. ...????). I connected the blue wire to B+ and the orange and red wires to the output plates. Strange distortion resulted, and I just couldn't figure it out. After changing out resistors that were only slightly drifted and even considering redesigning the entire amplifier (dumb idea, since this amplifier was produced successfully in huge numbers), I finally did a continuity test of the output transformer and discovered my mistake. The radio now plays beautifully.
T.
properly to begin with?
:
:Check all wiring thoroughly and slowly. Check all capacitor values. Check all resistor values and resistances to be sure that you didn't do something like reverse colors and install an incorrect value resistor.
:
:...And, of course, check tubes for shorts and gas and other faults. Be sure to perform an element to element shorts test.
:
:A few months ago I restored an Airline 14WG-806A. This radio was terrible. Someone kept it in a barn or something. The cabinet was fairly bad, and the chassis was badly rusted and covered with mouse/chicken excrements. The rubber wiring was badly decayed, so I decided to gut the entire chassis down to just the tube sockets. After cleaning away most of the rust, and painting the chassis (something I don't normally do), I rewired using cloth push-back wire. The output transformer, which is for push-pull, has a blue, red, and orange set of primary wires. Now, normally blue is plate and red is B+, but for whatever reason I assumed that the blue wire was black or something (also, this radio does not use conventional wire color-coding; B+ is blue throughout the radio except for the output transformer and the eye socket....red is for filament wiring. ...????). I connected the blue wire to B+ and the orange and red wires to the output plates. Strange distortion resulted, and I just couldn't figure it out. After changing out resistors that were only slightly drifted and even considering redesigning the entire amplifier (dumb idea, since this amplifier was produced successfully in huge numbers), I finally did a continuity test of the output transformer and discovered my mistake. The radio now plays beautifully.
:
:T.
:
Tks for the quick response...When I received the radio the EZ80 tube was missing.The load resistor off the EZ80 was open and the 2k resistor on the output Xmfer was open.After replace thes I brought the radio up on a variact but came up with the low vol problem...I then proceeded to do the the E-caps and other caps that were out of spec.tried the radio after that and still low vol.replaced all out of spec resistors and tried the radio again...still low volum.
I have tested the tubes with my Hickok tester all test fine so I did a tube by tube sub but still have the low volumn.Rechecked my work all seems ok...Does anyone have a schematic for this set??
|
::Could be many many reasons. Did the radio work
:properly to begin with?
::
::Check all wiring thoroughly and slowly. Check all capacitor values. Check all resistor values and resistances to be sure that you didn't do something like reverse colors and install an incorrect value resistor.
::
::...And, of course, check tubes for shorts and gas and other faults. Be sure to perform an element to element shorts test.
::
::A few months ago I restored an Airline 14WG-806A. This radio was terrible. Someone kept it in a barn or something. The cabinet was fairly bad, and the chassis was badly rusted and covered with mouse/chicken excrements. The rubber wiring was badly decayed, so I decided to gut the entire chassis down to just the tube sockets. After cleaning away most of the rust, and painting the chassis (something I don't normally do), I rewired using cloth push-back wire. The output transformer, which is for push-pull, has a blue, red, and orange set of primary wires. Now, normally blue is plate and red is B+, but for whatever reason I assumed that the blue wire was black or something (also, this radio does not use conventional wire color-coding; B+ is blue throughout the radio except for the output transformer and the eye socket....red is for filament wiring. ...????). I connected the blue wire to B+ and the orange and red wires to the output plates. Strange distortion resulted, and I just couldn't figure it out. After changing out resistors that were only slightly drifted and even considering redesigning the entire amplifier (dumb idea, since this amplifier was produced successfully in huge numbers), I finally did a continuity test of the output transformer and discovered my mistake. The radio now plays beautifully.
::
::T.
::
:Tks for the quick response...When I received the radio the EZ80 tube was missing.The load resistor off the EZ80 was open and the 2k resistor on the output Xmfer was open.After replace thes I brought the radio up on a variact but came up with the low vol problem...I then proceeded to do the the E-caps and other caps that were out of spec.tried the radio after that and still low vol.replaced all out of spec resistors and tried the radio again...still low volum.
:I have tested the tubes with my Hickok tester all test fine so I did a tube by tube sub but still have the low volumn.Rechecked my work all seems ok...Does anyone have a schematic for this set??
:
:
Raw B+ on pin 3 of the EZ80 is 295V
EL84..
pin 7= 270V
9= 225V
3= +7.9V
Reistors off of pin 9 on the EABC80 are well with in tol @ 100k and 200k
Injecting a signal from a cd player @ the Hi end of the vol pot Audio is low and distorted....
I await your command....
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:Sir Micro 9. . . . .
:
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:Assuming that this low volume is the situation on all of the bands of the unit.
:If mine to evaluate, I would next be trying the test inputting of raw audio thru a shielded line to the top . .high . . end of the volume control from the audio of either a CD player-DVD player or even the audio from a VCR player,to see if full volume is then attainable from the sets complete audio system.
:
:
:If then weak, even with that standardized level of input, one can then certainly tend to fault a problem(s) in the sets power supply---1st AF amp stage---AF audio output stage---output transformer or speaker system.
:
:
:Now, I have no schematic for that off the normal road model, but it seems to be using an EZ80 rectifier for the power supply and an EL84 for the audio output tube, along with an EABC 80 doing the preliminary AF preamp processing.
:
:
:Check and confirm for us what the raw B+ out of the rectifier is and what level finally ends up at the plate (#7) of the EL84.
:
:
:Also what is the B+ voltage present at the screen (#9) of the EL84, as well as its cathode (#3) voltage IF a cathode resistor is being used at that point
:to ground for acquiring self biasing.
:
:
:Now back at the at the EABC80 what is the possibility that its plate (#9) load resistor has skyrocketed up in resistive value thru the years, starving its plate of voltage swing ?
:
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:The load resistor off the EZ80 was open
:
:
:
:Now, would that be a series "filter" / dropping resistor establishing the sub B+ level from the high raw B+ level, or possibly a lower value resistor placed from the centertap of the
: power transformer high voltage winding to ground, for its establishing a neg bias voltage for the a AF output stage ?
:
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:Just my initial "seek out and ye shall find" thoughts ?
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:73's de Edd
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:
:::Could be many many reasons. Did the radio work
::properly to begin with?
:::
:::Check all wiring thoroughly and slowly. Check all capacitor values. Check all resistor values and resistances to be sure that you didn't do something like reverse colors and install an incorrect value resistor.
:::
:::...And, of course, check tubes for shorts and gas and other faults. Be sure to perform an element to element shorts test.
:::
:::A few months ago I restored an Airline 14WG-806A. This radio was terrible. Someone kept it in a barn or something. The cabinet was fairly bad, and the chassis was badly rusted and covered with mouse/chicken excrements. The rubber wiring was badly decayed, so I decided to gut the entire chassis down to just the tube sockets. After cleaning away most of the rust, and painting the chassis (something I don't normally do), I rewired using cloth push-back wire. The output transformer, which is for push-pull, has a blue, red, and orange set of primary wires. Now, normally blue is plate and red is B+, but for whatever reason I assumed that the blue wire was black or something (also, this radio does not use conventional wire color-coding; B+ is blue throughout the radio except for the output transformer and the eye socket....red is for filament wiring. ...????). I connected the blue wire to B+ and the orange and red wires to the output plates. Strange distortion resulted, and I just couldn't figure it out. After changing out resistors that were only slightly drifted and even considering redesigning the entire amplifier (dumb idea, since this amplifier was produced successfully in huge numbers), I finally did a continuity test of the output transformer and discovered my mistake. The radio now plays beautifully.
:::
:::T.
:
:
:
:::
::Tks for the quick response...When I received the radio the EZ80 tube was missing.The load resistor off the EZ80 was open and the 2k resistor on the output Xmfer was open.After replace thes I brought the radio up on a variact but came up with the low vol problem...I then proceeded to do the the E-caps and other caps that were out of spec.tried the radio after that and still low vol.replaced all out of spec resistors and tried the radio again...still low volum.
::I have tested the tubes with my Hickok tester all test fine so I did a tube by tube sub but still have the low volumn.Rechecked my work all seems ok...Does anyone have a schematic for this set??
::
::
:
:
T.
T.
:
:T.
:
This is a late 50's or early 60's German made radio...the other German sets of this area I have worked on usally have resistor across the output to drop voltage to the other stages of the radio...
these usally open with age....
Micro9
:
:T.
:
This is a late 50's or early 60's German made radio...the other German sets of this area I have worked on usally have resistor across the output to drop voltage to the other stages of the radio...
these usally open with age....
Micro9
T.
:
:T.
:
I have a schematic for a Wega 114 which is close but not the same.can I e-mail it to you??
TKS for all of your help..