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Hi, I am down to 2 caps needed for a Dyna PAM-1 rebuild. The 2 capacitors needed are the 2 big ones in the selenium rectifier. I have a PAS-2 also with the same 2 big caps.It calls for 2 1000 mfd caps. The manual does not state the voltage rating.I'm looking at an old one and have found the printed data; 1000 mfd, 15 W.V.D.C.,then underneath that 20 V.S.P. I'm not to sure how to read that. Am I looking for a 15 volt rating? Thanks in advance for any help.I had bought 2 1000 uf caps at 50V but they are the size of a root beer barrel candy while the originals are the size of a roll of quarters. Thanks again, Mark Korda.(kordamark@gmail.com)
Follow Ups:
I found a HUGH improvement replacing the crappy volume control in the pas to a Noble. Or if you have the funds - a Goldpoint attenuator - NICE!!!!
Also consider replacing the Selenium rectifier with diodes. But do NOT get rid of the rectifier tube.
I think I upped the 1000uf cap value to 4500uf, or some increased number??? but that was a long time ago and I really can't remember that clearly.
But again, the biggest improvement was the volume control. After you replace it you realize - Wow, that original was awful!
charles
Hi Hennie Airtime, that joke sort of classifies the comedian, it reminds me of Hennie Youngman or Gabe Kaplan. I have 3 tube shields for you and an easy day tomorrow so if you want them send me your address, I'll leave an e-mail. I have every thing I need to build 2 Dyna PAM-1's. I'm still not sure about the 1000 mfd caps,they just look to small, the 50 volt ones I bought(selenium rectifier caps).My goal is to eliminate the tone controls although at times I am told to leave them. I started the wheels turning on this project a few years ago when building a little transformer passive preamp using the PAM chassis. A guy named (Clyde the Cat) on the Audio Circle under Tubefile came up with what I should do and made it easy with erasing what I needed to omit on a picture of the PAM's schematic. Frank VanAlStine voiced in and said it should work.This was a few years ago. Today Frank thinks it's a waste of time, but I don't. If I could get guys like You,Samra,E. Duttman,Uncle Stu, or any who,sorry if I did not mention your name,to give the ok, that it might work, then the project continues. I put GoldPoints in the other project but will go with 10 dollar 500 ohm pots, still way better until I find out if the circuit works.I am going to start looking for a Dyna PS-1 power supply.I still have not finished the chassis of a pair of Mark3's which I am also in the process of trying to get finished. With 2 new cap boards to be installed I'm not sure yet if the power sockets can be used.Anyway, my email is (kordamark@gmail.com) and those shields are waiting for you. P.S. I have gone back to the Stone Age with Windows 8.I used to be able to forward a picture with nary a problem. If anyone can give me some tutoring in this respect I would love it.If you go slow I'll write it down and tattoo it to my arm.....thanks Mark.
I see you're making good headway on the preamps. I just got back from London and boy are my arms tired! A joke as old as our stereos.
What kind of modifications are you making on the PAS 2? A full rebuild or are you modifying the circuit and power supply.
I did a rebuild on the PAS 2 and found I liked the tube rectification with a simple upgrading of the power supply caps.
Let me google it and see what I come up with.
charles
New caps are much smaller than caps from the days that preamp was made. The 50V caps will work just fine.
Hi Hornlover, I had a feeling what you said was going to be the answer but I had to hear it from someone. Thanks.I'm still puzzled about voltage readings and what I wrote down, the caps specs, did that mean that the caps were rated for 15 volts. Horn, I guess what I'm trying to say is how much or how little voltage would be optimum for the selenium rectifier for a PAS-2,3.3X, or in my case the PAM-1 mono....thanks Hornlover....Mark Korda
A caps voltage rating is the maximum voltage the cap is designed to handle. Using a cap with a higher rating is OK.
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