Pull it out of the heap and had a look at it. Kinda crusty but all original. Spent an hour or so replacing 3 paper cap and one bakelite a 3651YU (#16). That one has two caps in series a .05 and .03. Anybody got a wiring diagram of it?? Pretty sure I've got it wired correctly but want to double check. It and two of the paper caps are fairly hard to get at there down between the oscillator coils and band switch. Wired in a couple of electrolytic caps and took it for a test drive. Makes rf but no modulation. Measured some voltages and they seem a bit low. Ac voltage from the rectifier plates to chassis 127v and 0V. Not good as half of the hv winding is open. Pretty sure somewhere around I have 125-0-125v @15ma transformer http://www.myvintagetv.com/Apple%20PDF%2...ervice.pdf
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 it!
Thx for thanks a look but some buddy isn't telling the truth. 077 schematic sez .03 and .05 not .3. I did wire it correctly but have no 400cy tone. Will try paralleling the .03 w/a.25 and see if that gets me oscillating.
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 it!
Don't think a .3 and a .05 would physically fit inside the bakelite housing. Barely will fit a modern .25 @630v would think a 400v unit wouldn't be much smaller.
Off to go dig up a transformer.
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 it!
Found a little transformer in the shed. Filament winding is a little lite so will dump the 6X5G that was in it and replace it w/a diode. It's also set up for a half wave rectifier (no center tap) just need one diode instead of two.
With the old transformer half open a half wave circuit is what I had with it. Same voltage but 1/2 the current.
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 it!
Replaced the transformer and is making abt 90vdc after the filter and such. Might be a little low so I could remove the #23 and replace it w/an iron core choke. This has a low resistance and filters ac better than a resistor which = higher voltage. Got to play w/it a bit more.
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 it!
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