RP3 help - Printable Version
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RP3 help - rjm - 12-09-2020
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?
RE: RP3 help - Phlogiston - 12-09-2020
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
RE: RP3 help - rjm - 12-09-2020
It's a Philco wireless 1939 record player.
RE: RP3 help - David - 12-09-2020
What kind of ant. are you using?
RE: RP3 help - rjm - 12-09-2020
one used in the original factory design.
RE: RP3 help - Radioroslyn - 12-09-2020
https://philcoradio.com/library/download/service%20info/yearbooks/1939/split/Part43-Philco%201939%20RMS%20Year%20Book.pdf
RE: RP3 help - rjm - 12-09-2020
Really bro???
RE: RP3 help - Radioroslyn - 12-09-2020
So how much ac voltage do you have from pin 2 of the 84 to chassis and pin 3 to the chassis?
RE: RP3 help - Phlogiston - 12-09-2020
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.
RE: RP3 help - rjm - 12-09-2020
105.1 v pin 2 and 105.4 pin 3
RE: RP3 help - rjm - 12-09-2020
plate on the 6A7 is 101.5v
RE: RP3 help - Phlogiston - 12-09-2020
Is that 1 meg variable resistor good? What happens when you adjust it?
RE: RP3 help - rjm - 12-09-2020
yes. it shuts down the transmitting when turned be it on a little over 2 ft.
RE: RP3 help - Phlogiston - 12-09-2020
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?
RE: RP3 help - morzh - 12-09-2020
6A7 tubes are often weak. The Mixing part.
Maybe it just needs replacement.