Tube Phono Preamp PCB Ebay? are these any good

[fortytwo]

I have decided to do the RJM design.

From my reading this is what i got so far.
all caps would be poly film caps (brand?) I would prefer to order from mouser but they dont carry illionis caps. I will some day replace the coupling and riaa caps with expensive ones but i just want to do it reasonavbly for now.

For resistors i think it looks like every one uses wire wound precision ones. I do have a pile of old carbon risistors given to me by a univac tech. Would these be ok to use.

sockets new, tubes new or used. Wiring solid copper, interconnects good gold plated ones (Brand?)

The powersupply just good 105 degree caps. Random parts stole out of old copiers.

a question, on the build page there is mention of using 2x8uf caps on the B+ input for each stage on the amp end? What exactly is meany by this? What type of caps? electrilital?
Thanks
FortyTwo

[rman]

Hi fourtytwo.

Life the universe and everything?

I used Solen caps for coupling and the B+ bypass caps. I think these are the ones you mean, they are extra power supply filters. The designer recommended the Solens. Blackgates for cathode bypass. They are expensive and getting hard to find. I think Nichon? are popular for this. For the riaa caps I couldn't get high precision ones so I bought lots of cheap ones and a capacitance meter. 1% metal film resistors here. I used multi turn pots but they maybe causing some white noise. Metal oxide resistors for the plates and cathodes. Carbon types are said to be noisy when high value or at high voltage. For tubes I used new Electro Harmonix 6922's. I also tried some JAN Sylvania 6DJ8's. These sounded fine as well but are much more microphonic. Interconects, I guess just keep them short.

Cheers.

[juliovideo]

8audio sale preamp parts etc


http://stores.shop.ebay.com/8Audio_P...34Q2ec0Q2em322




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