Scott

You mention there is AF signal at the plate of the 76 but not on the grid of the output tube. Try bypassing cap 11Y, with another cap, which couples the plate of the 76 to the grid of the 6B5.

The supressor and cathode voltage on the 6D6 are dependent on the volume control setting.

Norm

: You mention there is AF signal at the plate of the 76 but not on the grid of the output tube. Try bypassing cap 11Y, with another cap, which couples the plate of the 76 to the grid of the 6B5.

: The supressor and cathode voltage on the 6D6 are dependent on the volume control setting.

: Norm

Norm,

Even though the 11Z cap tested good, I changed it out like
you said. I rerouted the 11Z cap directly from the detector
plate to the output grid, even though originally it went
to ground and connected with 11Y. That fixed it. Maybe I
didn't have a connection between the two caps before.
Thanks for all your help, this was a great learning experience.
Next up, a GE 71 that didn't work when I got it. Puts out
alot of static though. By the way, any suggestions on what
to look for in an oscilloscope for this kind of servicing?
Thanks again.
Scott

: : Scott

: : You mention there is AF signal at the plate of the 76 but not on the grid of the output tube. Try bypassing cap 11Y, with another cap, which couples the plate of the 76 to the grid of the 6B5.

: : The supressor and cathode voltage on the 6D6 are dependent on the volume control setting.

: : Norm

: Norm,

: Even though the 11Z cap tested good, I changed it out like

: you said. I rerouted the 11Z cap directly from the detector

: plate to the output grid, even though originally it went

: to ground and connected with 11Y. That fixed it. Maybe I

: didn't have a connection between the two caps before.

: Thanks for all your help, this was a great learning experience.

: Next up, a GE 71 that didn't work when I got it. Puts out

: alot of static though. By the way, any suggestions on what

: to look for in an oscilloscope for this kind of servicing?

: Thanks again.

: Scott

Hi Scott,
It's great that you finally got your crosley going well, I'm sure you wondered if it would ever talk. However you have learned a lot more from chasing s difficult series of faults like this and they will get easier. You mentioned that you connected capacitor 11Z across 11Y instead of from the 76 plate to ground. This is a small capacitor (0.001 mF) which bypasses the RF signals but allows the audio to pass. It filters out any RF from the output stage and will also rduce the higher audio frequencies. I suggest you reconnect this back as per the schematic. You ask about an oscilloscope for testing these radios and as an old TV technician Im used to using a scope but they're not really essential for radios. If you want to get one any recent 'scope with a frequency response of a few mHz and a sensitivity of about 10 mV or so will be fine. A devide by 10 probe is usefull as they have a much lower input capacitance and won't affect the tuning of any tuned circuits you are looking at so much. There are many good CRO's at club swap meets and auctions if you don't want to buy a new one. Be carefull of live chassis, it's a good idea to have an isolation transformer when workink on them for safety. If you don't isolate the set you can shourt the mains out through any grounded test equipment such as a CRO.

Norm,

Just to clarify, don't think you saw my correction on the 515.
I didn't change the circuit, I just made it look physically
like the schematic. I moved the 11Y directly from the plate of
the 76 to the grid of the output. The 11Z still goes from 76
plate to ground. Originally, the 11Z went from the plate to
the ground lug where it connected with 11Y, I couldn't get it
to work that way when I replaced the caps. Although not
as neat as the original wiring, it's still schematically correct.
Someday I'll try to put it back the way it was.
On the scope, I've got an old Heathkit CRO that was given
to me. Recurrent sweep type with a requency response to 5 mHz and
sensitivity is 30 mV. Works o.k., but can't always freeze the trace
and probably need to get a 10X probe. I do use an an isolation
transformer on live chassis.

Scott

: Norm,

: Just to clarify, don't think you saw my correction on the 515.
: I didn't change the circuit, I just made it look physically
: like the schematic. I moved the 11Y directly from the plate of
: the 76 to the grid of the output. The 11Z still goes from 76
: plate to ground. Originally, the 11Z went from the plate to
: the ground lug where it connected with 11Y, I couldn't get it
: to work that way when I replaced the caps. Although not
: as neat as the original wiring, it's still schematically correct.
: Someday I'll try to put it back the way it was.
: On the scope, I've got an old Heathkit CRO that was given
: to me. Recurrent sweep type with a requency response to 5 mHz and
: sensitivity is 30 mV. Works o.k., but can't always freeze the trace
: and probably need to get a 10X probe. I do use an an isolation
: transformer on live chassis.

: Scott
Hi Scott,
Sorry for the confussion, it sounded like you had connected 11Z in parallel with 11Y, you obviously have it correct. The Heathkit CRO should be fine for any radio work, you can check distortion and use it to signal trace if necessary. I think it must have a fault if it's not triggering well, my experience with Heathkit equipment is that they work well. Some of these scopes also have different triggering modes available to allow solid locking on TV horizontal and vertical signals as well as normal triggering. If it's on the wrong setting this can make it unsteady. Do you have a schematic for the CRO? Whoever gave it to you may have built it themselves and they come with excellent schematics and construction; operation details. It's possible that when it was assembled there was a small wiring mistake, that's very easy to do when building a kit. If you can't get the instruction book post a request on this site, they were very popular and I,m sure someone will be able to help with one. Norm and I are not sure if we've got a schematic for your GE71. I've got a schematic for a GE H71 which is equivalent to RCA Radiola models 80, 82 & 86. This is a superhet and uses a 224 RF amp., 227 osc., 224 1st. det.(mixer), 224 1st. IF amp., 224 2nd. IF amp., 227 2nd. det.(AF detector), two 245 push pull output, and 280 rectifier. Does this sound likeyourset? If not can you list the tube line-up please and we'll try and help you get it going. I think Norm has a couple of other GE71 schematics with different letter prefixes. After the Crosley it should be a piece of cake. Try checking the usuall things first such as filter (electrolytic) and paper capacitors and let us know how you're going. Good luck, Don.

: Hi Scott,
: Sorry for the confussion, it sounded like you had connected 11Z in parallel with 11Y, you obviously have it correct. The Heathkit CRO should be fine for any radio work, you can check distortion and use it to signal trace if necessary. I think it must have a fault if it's not triggering well, my experience with Heathkit equipment is that they work well. Some of these scopes also have different triggering modes available to allow solid locking on TV horizontal and vertical signals as well as normal triggering. If it's on the wrong setting this can make it unsteady. Do you have a schematic for the CRO? Whoever gave it to you may have built it themselves and they come with excellent schematics and construction; operation details. It's possible that when it was assembled there was a small wiring mistake, that's very easy to do when building a kit. If you can't get the instruction book post a request on this site, they were very popular and I,m sure someone will be able to help with one. Norm and I are not sure if we've got a schematic for your GE71. I've got a schematic for a GE H71 which is equivalent to RCA Radiola models 80, 82 & 86. This is a superhet and uses a 224 RF amp., 227 osc., 224 1st. det.(mixer), 224 1st. IF amp., 224 2nd. IF amp., 227 2nd. det.(AF detector), two 245 push pull output, and 280 rectifier. Does this sound likeyourset? If not can you list the tube line-up please and we'll try and help you get it going. I think Norm has a couple of other GE71 schematics with different letter prefixes. After the Crosley it should be a piece of cake. Try checking the usuall things first such as filter (electrolytic) and paper capacitors and let us know how you're going. Good luck, Don.

Hi Don,
The Heathkit CRO is a recurrent sweep whether that makes any
difference or not. Its got vertical settings for DC X1, X10, X100
the same for AC and a gain control, and horizontal settings for 10,
100, 1K, 10K, 100K, 500K and EXT IN and a gain control. Other
knobs control frequency vernier, horiz and vert position, intensity
and focus, int/ext sync and there's vertical, horizontal, two grounds,
ext sync and IV PP input jacks. The op instructions with
it aren't the best, but I'm pretty clear on most of it. I calibrated
it according to the instructions after locating an open resistor in
the horizontal section that caused it to go bad and end up in my
hands. But using it on a normally functioning Setchell Carlson superhet,
I couldn't freeze the wave patterns past the mixer stage. I'll go thru
the schematic and check the circuits. I'd like to use this scope since
the price is right, but I'm being tempted by a great price on a
recondition Tektronics that is way more than I need. Enough of that.
The GE is an E-71, uses a 6A8 converter/osc, 6K7s for 1st and 2nd IF AMPs,
a 6H6 detector and AVC, a 6F5 audio AMP, a 6F6 output and
a 5W4 rectifier. Tubes all test good, I've already replaced all the caps
which didn't improve anything. Signal injected at the volume control is
heard, so I'll be checking out the front end. I'll be in touch, really
appreciate all the info.

Scott

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