EL84 Triode PP Design

sorenj07 · 14th December 2007, 03:10 AM

I have the EL84's, the OPT's, and the 6N23P's are on the way.

Power supply:
Hammond 273BX (350-0-350 175mA) rectified by two UF4007 per leg bypassed by .1uF 1KV, into 193M choke (10H 300mA 63 ohms) and 440uF 450V cap, bypassed with 1uF 630V, feeding B+. B++ taps off a 20H 20mA 1.67K and 100uF 400V bypassed with another 1uF 630V, for the two 6mA regulators at 275V. The C- supply is a voltage doubler running off the unused 5A tap.

SY · 14th December 2007, 04:00 AM

You've got a negative rail there, why not use it and do a better CCS tail for the input stage- or at least give the one you have a bit more headroom?

sorenj07 · 14th December 2007, 05:51 AM

Could I just connect the -15v supply right to the LM334 as it is?

SY · 14th December 2007, 11:27 AM

I don't know its voltage rating off the top of my head, but if that's within it, then yes, and that will give the CCS a little more breathing room.

Salas · 14th December 2007, 11:41 AM

He can bypass the LM CCS with a good lytic cap to increase quality, can't he? Better off with DC duty on such a CCS only?

SY · 14th December 2007, 12:27 PM

If he doesn't want the phase splitter to function, then sure, he can bypass the tail CCS.

Salas · 14th December 2007, 12:55 PM

Blunder. DC only works in SE.

Salas · 14th December 2007, 01:05 PM

But how it works in Baby Huey? Is it partial?

SY · 14th December 2007, 01:13 PM

It's only bypassing the reference string, not the CCS terminal (the collector of the "upper" transistor).

Salas · 14th December 2007, 01:22 PM

Must be sounding better this partial thing. I have to check it out in mine.

14th December 2007, 03:10 AM	#1
sorenj07 diyAudio Member Join Date: May 2006	EL84 Triode PP Design I have the EL84's, the OPT's, and the 6N23P's are on the way. Power supply: Hammond 273BX (350-0-350 175mA) rectified by two UF4007 per leg bypassed by .1uF 1KV, into 193M choke (10H 300mA 63 ohms) and 440uF 450V cap, bypassed with 1uF 630V, feeding B+. B++ taps off a 20H 20mA 1.67K and 100uF 400V bypassed with another 1uF 630V, for the two 6mA regulators at 275V. The C- supply is a voltage doubler running off the unused 5A tap.

14th December 2007, 04:00 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	You've got a negative rail there, why not use it and do a better CCS tail for the input stage- or at least give the one you have a bit more headroom? __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

14th December 2007, 11:27 AM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	I don't know its voltage rating off the top of my head, but if that's within it, then yes, and that will give the CCS a little more breathing room. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

14th December 2007, 12:27 PM	#6
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	If he doesn't want the phase splitter to function, then sure, he can bypass the tail CCS. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

14th December 2007, 01:13 PM	#9
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	It's only bypassing the reference string, not the CCS terminal (the collector of the "upper" transistor). __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

14th December 2007, 05:51 AM	#3
sorenj07 diyAudio Member Join Date: May 2006	Could I just connect the -15v supply right to the LM334 as it is?

14th December 2007, 11:41 AM	#5
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	He can bypass the LM CCS with a good lytic cap to increase quality, can't he? Better off with DC duty on such a CCS only?

14th December 2007, 12:55 PM	#7
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Blunder. DC only works in SE.

14th December 2007, 01:22 PM	#10
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Must be sounding better this partial thing. I have to check it out in mine.

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