I'm rebuilding this Philco pushbutton radio, otherwise very similar to the 41-221. Replaced all caps, filters, ckd tubes. Got schematics and realigned acc to directions for a 221. Best I could get was 2 strong stations mixed together at about 700 and 1000MC on the BC dial. No shortwave. Cleaned and ckd the tuning capacitor. Replaced the BC tuning coil. Nothing seemed to help. What to try next??

Hi

Check the oscillator circuit of your radio. It uses a XXD (14AF7) tube. The oscillator coil may be open or bad band switch contact?

Norm

:I'm rebuilding this Philco pushbutton radio, otherwise very similar to the 41-221. Replaced all caps, filters, ckd tubes. Got schematics and realigned acc to directions for a 221. Best I could get was 2 strong stations mixed together at about 700 and 1000MC on the BC dial. No shortwave. Cleaned and ckd the tuning capacitor. Replaced the BC tuning coil. Nothing seemed to help. What to try next??

:Hi
:
: Check the oscillator circuit of your radio. It uses a XXD (14AF7) tube. The oscillator coil may be open or bad band switch contact?
:
:Norm
:
::I'm rebuilding this Philco pushbutton radio, otherwise very similar to the 41-221. Replaced all caps, filters, ckd tubes. Got schematics and realigned acc to directions for a 221. Best I could get was 2 strong stations mixed together at about 700 and 1000MC on the BC dial. No shortwave. Cleaned and ckd the tuning capacitor. Replaced the BC tuning coil. Nothing seemed to help. What to try next??

Hi back, Ckd and replaced the oscilator transformer. Ckd the band switch. Both were good. The 1st IF transformer was ok but resistance was 17 and 9 ohms. Any other suggestions?
::Hi
::
:: Check the oscillator circuit of your radio. It uses a XXD (14AF7) tube. The oscillator coil may be open or bad band switch contact?
::
::Norm
::
:::I'm rebuilding this Philco pushbutton radio, otherwise very similar to the 41-221. Replaced all caps, filters, ckd tubes. Got schematics and realigned acc to directions for a 221. Best I could get was 2 strong stations mixed together at about 700 and 1000MC on the BC dial. No shortwave. Cleaned and ckd the tuning capacitor. Replaced the BC tuning coil. Nothing seemed to help. What to try next??

Hi,
Have you checked the IF's for an open winding? There is a small chance that yours might have a "gimick" winding, (a winding with only one side connected to anything), which would show up when you open the can itself, but if you only have 4 terminals, you should have continuity between 2 of the terminals (2 pairs of 2). If they seem to check out okay, try below:

I would try "noise injection"- a plastic handled screw driver that you touch the blade to the grids and plate connections on each tube. Start from audio out, then work your way back through each stage until you no longer produce noise on a G1 or plate. Once isolatated in this manner, you may find a cold solder joint, shorted wire, stray solder blob, etc. My inclination is to suspect either the final IF transformer is open on the secondary (possibly primary, but you will lose plate voltage at the IF stages of at least one tube.) Replace the paper caps in that stage where signal transfer is lost too.

:Hi back, Ckd and replaced the oscilator transformer. Ckd the band switch. Both were good. The 1st IF transformer was ok but resistance was 17 and 9 ohms. Any other suggestions?
:::Hi
:::
::: Check the oscillator circuit of your radio. It uses a XXD (14AF7) tube. The oscillator coil may be open or bad band switch contact?
:::
:::Norm
:::
::::I'm rebuilding this Philco pushbutton radio, otherwise very similar to the 41-221. Replaced all caps, filters, ckd tubes. Got schematics and realigned acc to directions for a 221. Best I could get was 2 strong stations mixed together at about 700 and 1000MC on the BC dial. No shortwave. Cleaned and ckd the tuning capacitor. Replaced the BC tuning coil. Nothing seemed to help. What to try next??

:Hi,
:Have you checked the IF's for an open winding? There is a small chance that yours might have a "gimick" winding, (a winding with only one side connected to anything), which would show up when you open the can itself, but if you only have 4 terminals, you should have continuity between 2 of the terminals (2 pairs of 2). If they seem to check out okay, try below:
:
:I would try "noise injection"- a plastic handled screw driver that you touch the blade to the grids and plate connections on each tube. Start from audio out, then work your way back through each stage until you no longer produce noise on a G1 or plate. Once isolatated in this manner, you may find a cold solder joint, shorted wire, stray solder blob, etc. My inclination is to suspect either the final IF transformer is open on the secondary (possibly primary, but you will lose plate voltage at the IF stages of at least one tube.) Replace the paper caps in that stage where signal transfer is lost too.
:
:
:
::Hi back, Ckd and replaced the oscilator transformer. Ckd the band switch. Both were good. The 1st IF transformer was ok but resistance was 17 and 9 ohms. Any other suggestions?
::::Hi
::::
:::: Check the oscillator circuit of your radio. It uses a XXD (14AF7) tube. The oscillator coil may be open or bad band switch contact?
::::
::::Norm
::::
:::::I'm rebuilding this Philco pushbutton radio, otherwise very similar to the 41-221. Replaced all caps, filters, ckd tubes. Got schematics and realigned acc to directions for a 221. Best I could get was 2 strong stations mixed together at about 700 and 1000MC on the BC dial. No shortwave. Cleaned and ckd the tuning capacitor. Replaced the BC tuning coil. Nothing seemed to help. What to try next??

:Hi,
:Have you checked the IF's for an open winding? There is a small chance that yours might have a "gimick" winding, (a winding with only one side connected to anything), which would show up when you open the can itself, but if you only have 4 terminals, you should have continuity between 2 of the terminals (2 pairs of 2). If they seem to check out okay, try below:
:
:I would try "noise injection"- a plastic handled screw driver that you touch the blade to the grids and plate connections on each tube. Start from audio out, then work your way back through each stage until you no longer produce noise on a G1 or plate. Once isolatated in this manner, you may find a cold solder joint, shorted wire, stray solder blob, etc. My inclination is to suspect either the final IF transformer is open on the secondary (possibly primary, but you will lose plate voltage at the IF stages of at least one tube.) Replace the paper caps in that stage where signal transfer is lost too.
:
:
:
::Hi back, Ckd and replaced the oscilator transformer. Ckd the band switch. Both were good. The 1st IF transformer was ok but resistance was 17 and 9 ohms. Any other suggestions?
::::Hi
::::
:::: Check the oscillator circuit of your radio. It uses a XXD (14AF7) tube. The oscillator coil may be open or bad band switch contact?
::::
::::Norm
::::
:::::I'm rebuilding this Philco pushbutton radio, otherwise very similar to the 41-221. Replaced all caps, filters, ckd tubes. Got schematics and realigned acc to directions for a 221. Best I could get was 2 strong stations mixed together at about 700 and 1000MC on the BC dial. No shortwave. Cleaned and ckd the tuning capacitor. Replaced the BC tuning coil. Nothing seemed to help. What to try next??

John, I have ckd all of the i.f. transformers now and all seem to have the proper resistance. It has all new caps. Have reckd all of them and all the resisters. The grids and plates seem to respond to the noise test. Only problem I find is low plate voltage for all the plates. The output 50L6 plate is 30 v. the 2nd i.f. 7B7 is 5 v. Replaced the speaker too, no improvement. Radio able to boom out on a couple places on the BC dial only one station mixed with another. Unable to sort out the stations. No cold solder joints found. Many Tks, T.