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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 29 Aug 2009, 21:52 
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Joined: 14 Oct 2008, 17:35
Posts: 901
Location: Dartmouth, Nova Scotia
So than Gio, I'm guessing that the 340-340 volt Harman Kardan transformer shown in the first picture won't be to much for the power supply? I seem to have this problem with every project where I reuse old parts, the voltages are ither too high or too low, and the transformer with the perfect voltage is ither too small or too massive to be worth using. :)

I think 428V will be what will come out plus there is voltage drop in the choke, but I am not good at predicting the exact voltage of a power supply other than what comes out of the calculator. I suppose it couldn't be any worse than the original supply, but I do like to keep atleast a 100V below the maximum ratings of components in a high voltage supply becuase there is also lots of heat produced from the tubes in a confined preamp like this.

Right at this momment from as far as I can tell, every thing is working no flaws in both my phono stage or power supply! :D Other than the fact that I did the test of a 50V transformer, which sadly only got me 24V at the supply output but it was good enough to be sure there were no shorts or miswiring, and even more promosing was the fact that I got music to play (barely).

I have lots of pictures so keep whatching! ;)

My Mini 12AU7 Tube Preamp, Pioneer SX-D7000, JVC XL-V221BK, JBL L80T, DCM TF700

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