Quote:
Originally Posted by vishalk
Quick question about capacitor values:
Some of the caps i cant purchase the exact values so i have a choice of two.
C4 - C6 is originally 0.25uf i can either have 0.22uf or 0.33uf @400v-630v
Most of them i can get exact values, for above do i go 0.22uf or 0.33uf?
Thanks
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0.22uF is the nearest preferred value to the 0.25uF. Any working voltage above 350V is suitable, I'd go for 400 or more to give a bit of extra safety margin as the Ht will be around the 320 to 330V mark.
Now then, had you read your Spicer book "Firsts in high fidelity", You would have discovered for yourself the reasons for the circuit differences and the differences in the 3925 and 8778 transformers. I don't want to sound "preachy" but most of the info you need is in that book. Including the correct circuit diagrams.
I will also confirm with the rest of the good advice here for you not to get hung up on fancy resistors and capacitors. Use good quality standard plastic film capacitors for coupling. I have stated this in an earlier post, I did the expensive experiments for you so to speak! I used the standard 630V vishay polyester caps in my "new build" of the leak Tl25+ circuit and have never felt any need to "Upgrade" them. And I'm rather fussy about perceived sound quality.
Again, resistors, I use fairly mundane metal film 1% ones as they are as inexpensive as any other good resistor, I also agree with the suggested suppliers from other posters. I usually try RS online for my bits.
Again as others have observed, you are extremely unlikely to get British made components and in any case you'll never get original parts (that are serviceable). So do what HJL would almost certainly have done and use the best value decent quality and appropriate parts available on the market.
It's great news that your valves have tested good, there's a decent bit of money saved.
I hope I haven't put you off Vishalk and I do hope you get your stereo20 singing soon. I'm listening to mine as I type and very nice it is too.
Andy