Well, I kind of liked the look of it.. But however .. Another problem cropped up...
The Radio will motorboat at approx 1/2 way on tuning.. For a very small area.. This is on AM band. I do not think it does it on the other bands But I will check.. Also saw this on top of tuning cap that goes from cap to the 6A8 tube..
I don't think that the 6A8 , [in the first photo] needs a shield as it is metal. please correct me if I am wrong.
If all 6A8 tubes are to be shielded I will do that in the future.
Dan in Calgary.
Regarding the shield if you are using a metal tube and pin 1 of the socket is connected to chassis ground then all is well. Metal tube w/pin 1 not connected to ground needs a shield. Glass tube needs a shield.
Wire L like Mike sez is a gimmick capacitor. In this circuit it's used the couple a little bit of signal from the local oscillator into the input of the mixer.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Well, It only does it on Broadcast band. I was able to get rid of it by De-tuning one of the IF cans. Then it went away . All seems OK and I still receive all the stations I did before.. on broadcast band.
Ops I forgot to check the other bands to see if they are OK yet. Hope I didn't move problem ..
Ok on shortwave bands it doesn't motorboat. Both SW bands seem to be dead? Not completely but not right either. The alignment procedure is not the greatest.. See below:..
When I try to align I have to put in a big signal to get it to receive Meaning about -3 to +6 Dbm But with a strong signal like that I get the signal all over band. As I go down in signal strength to about -20 Dbm or so I cannot receive any signal. Also on SW bands the audio is extremely low have to turn up volume to Max and I still can only hear signal weakly..
Ok New development looks like the OSC is not working on the SW bands.. I get 0 volts on pin 5 of the 6A8 when on either SW band. On the Broadcast Band its -9 volts..
I'd take a close look at the band switch for dirty or broken contacts. Also check all the coils and caps that get switched in when a SW band is selected (measure all sections of coil # 2 and 3 to check for opens).
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"