Valve Itch phono - Page 12

Salas · 15th April 2011, 12:14 AM

Since I haven't seen it working with stringed heaters, I can't speak from experience. Gibson had used them in parallel for one. I would prefer you don't mix stages heaters if possible for this kind of gain app.

woodturner-fran · 15th April 2011, 12:27 AM

Sure - thats easy. I have some 15V transformers - which would suit ~12V heater supplies..... can use different secondaries for each, or even separate transformers. BTW, anyone looking for some - farnell still ahve some a ~€3 each!

Fran

Salas · 15th April 2011, 12:33 AM

You need two envelopes, one noval, one octal, at 1/2B+ elevated heaters for covering two channels in this phono. Another two the same at no elevation. Plan clear.

woodturner-fran · 16th April 2011, 12:32 PM

Valves and bases ordered today. Traffos in stock - just need to organise the parts list next....

Salas · 16th April 2011, 12:45 PM

Lets see who does the first one. We have early British & Australian interest but Irish outsider late entry may steal the contest.

woodturner-fran · 02:18 PM

Hah!! at the rate I'm going I really will be paddy last!

Anyway, giving back to community!!

BOM with mouser links.
PS info not included, wima caps chosen as reasonable base to start from, circuit numbered to match my own notes, prices are +vat.

Please double check!!!!

Fran

Salas · 16th April 2011, 03:04 PM

Quote:

Originally Posted by woodturner-fran

wima caps chosen as reasonable base to start from,

Fran

I would advise against the interstage coupling cap to be a Wima if possible. See for USSR K40Y PIO or 0.047uF K72P Teflon. Boutique PIO and Teflon no problem but can set back the budget heavily...

woodturner-fran · 03:16 PM

Yes, I'd agree - i'll add a note to say that k40y will sound better....

Would you suggest the same for output cap and RIAA ones?

Salas · 16th April 2011, 03:42 PM

For Riaa such caps lack in tolerance. For output I prefer 2u2 and to pre-shape the LF roll off with the interstage so it can mate many line inputs, still holding a determined rate fall. 47n to 100n interstage OK. 2u2 difficult in CCCP caps. Maybe K75-10 500B 1u//1u // FT3 0.1u. Green monstrosity with a silver accent.

woodturner-fran · 16th April 2011, 06:40 PM

Yes, I've heard that before - but it might be worth buying a number and matching by hand.

Anyway, I've found a russian federation seller on ebay and will be ordering from him.....

16th April 2011, 03:08 PM	#118
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Yes, I'd agree - i'll add a note to say that k40y will sound better.... Would you suggest the same for output cap and RIAA ones? Last edited by woodturner-fran; 16th April 2011 at 03:16 PM.

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15th April 2011, 12:27 AM	#112
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Sure - thats easy. I have some 15V transformers - which would suit ~12V heater supplies..... can use different secondaries for each, or even separate transformers. BTW, anyone looking for some - farnell still ahve some a ~€3 each! Fran

15th April 2011, 12:33 AM	#113
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	You need two envelopes, one noval, one octal, at 1/2B+ elevated heaters for covering two channels in this phono. Another two the same at no elevation. Plan clear.

16th April 2011, 12:32 PM	#114
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Valves and bases ordered today. Traffos in stock - just need to organise the parts list next....

16th April 2011, 12:45 PM	#115
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Lets see who does the first one. We have early British & Australian interest but Irish outsider late entry may steal the contest.

16th April 2011, 03:42 PM	#119
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	For Riaa such caps lack in tolerance. For output I prefer 2u2 and to pre-shape the LF roll off with the interstage so it can mate many line inputs, still holding a determined rate fall. 47n to 100n interstage OK. 2u2 difficult in CCCP caps. Maybe K75-10 500B 1u//1u // FT3 0.1u. Green monstrosity with a silver accent.

16th April 2011, 06:40 PM	#120
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Yes, I've heard that before - but it might be worth buying a number and matching by hand. Anyway, I've found a russian federation seller on ebay and will be ordering from him.....