02-20-2009, 12:42 AM
Hi Howard,
Others can tell you better than I can about a matching transformer.I am not good at impedance matching or things like that.
I figured the crystal cart would behigh impedance, maybe a frw hundred ohms and the input from an mp3 or tape device would be a lot lower.
What I did was go to the junkbox, and try some of the little audio type transformers I had. An audio output transformer worked for me, somewhat. There was a little distortion in the audio. I don't know if that's from the tape player I used, or the wrong match. or maybe other parts in the RP-1's circuit.
I am going to put the cartridge rebuild on hold for now, and get back to it later. At least for now, I know the unit operates and does what it's supposed to do.
Anyone else have some info on what to use for a matching transformer on this set?
I believe Howard and I have the same version, the code 123
The code 123 has a coupling cap (30pf)from the RF coil to the AC line. It also has only one line filter cap (.01 ) in the bakelite block, while the code 122 has two.
Take care,
Gary.
Others can tell you better than I can about a matching transformer.I am not good at impedance matching or things like that.
I figured the crystal cart would behigh impedance, maybe a frw hundred ohms and the input from an mp3 or tape device would be a lot lower.
What I did was go to the junkbox, and try some of the little audio type transformers I had. An audio output transformer worked for me, somewhat. There was a little distortion in the audio. I don't know if that's from the tape player I used, or the wrong match. or maybe other parts in the RP-1's circuit.
I am going to put the cartridge rebuild on hold for now, and get back to it later. At least for now, I know the unit operates and does what it's supposed to do.
Anyone else have some info on what to use for a matching transformer on this set?
I believe Howard and I have the same version, the code 123
The code 123 has a coupling cap (30pf)from the RF coil to the AC line. It also has only one line filter cap (.01 ) in the bakelite block, while the code 122 has two.
Take care,
Gary.
