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Have a RP3. Recapped, replaced resistors, and installed a new crystal cartridge. Still will only broadcast about 2ft. no more. Checked tubes, strong. am I missing something?
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City: Medford OR (OR what?)
I would suspect that many people have no idea what an RP3 is (I once worked on a Sonora RP3). Maybe if you told us a little more about it - picture?
https://www.radiomuseum.org/r/philco_rp3.html
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
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It's a Philco wireless 1939 record player.
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City: Wellborn Florida
What kind of ant. are you using?
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one used in the original factory design.
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City: Roslyn Pa
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!
Terry
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So how much ac voltage do you have from pin 2 of the 84 to chassis and pin 3 to the chassis?
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!
Terry
Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)
So you have a 6A7 doing its thing ( it is normally a osc/mixer in a receiver).
What is your plate voltage? Have you looked at it with a scope, how about a signal sniffer. I would suspect that a really good 6A7 might be required to get good range, not my favorite tube - still trying to get the Strat to osc. on band 5, reliably.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
(This post was last modified: 12-09-2020, 06:26 PM by Phlogiston.)
Posts: 70
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Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
105.1 v pin 2 and 105.4 pin 3
Posts: 70
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City: Newbern
State, Province, Country: Tennessee
plate on the 6A7 is 101.5v
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City: Medford OR (OR what?)
Is that 1 meg variable resistor good? What happens when you adjust it?
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
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Joined: Jan 2006
City: Newbern
State, Province, Country: Tennessee
yes. it shuts down the transmitting when turned be it on a little over 2 ft.
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City: Medford OR (OR what?)
I would think that it would vary the RF output considerably through the range, 0 to 1meg. So if you measure from the high side (xtal) to ground you get 1 meg.? I have to ask - again, because these Philco controls are often the problem, especially if they have been "cleaned".
It may also vary the output freq. a little. What is you output freq?
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
Posts: 16,490
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City: Jackson
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6A7 tubes are often weak. The Mixing part.
Maybe it just needs replacement.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
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