6V6 line preamp - Page 35

stajo · 7th January 2012, 04:49 PM

Well, here is the monster, with the scrap I had at home over the weekend.

Foilcoated plank, pre-war caps, trafo and a 5Z3 for now. I made dual filters for trying out dual AZ1 or such later. Got 2,3 k in the filters plus chokes now, had 335 V B+.

Behold the beauty
Staffan

Salas · 7th January 2012, 04:52 PM

Cool test preamp. Is it the gain version (common cathode) CCT? What make of tubes, and what heaters power scheme?

P.S. You already wrote AC for heaters, OK.

stajo · 7th January 2012, 05:02 PM

Yes, gain version. Were there a cathode follower to? Didnt see that. Tubes is old RCAs testing fair. Regular electrolytics as cathode resistor bypass, 1uF MKP output caps, resistors what I found around. Other then that, fairly as the schematic I found in this thread.

Heaters power scheme? Regular AC 2 lines 6,3 VAC from the trafo. It has 5 V to. From an old radio.

Staffan

Salas · 7th January 2012, 05:06 PM

RCAs are great. Black anode? Yes there was a bootstrapped cathode follower also shown for those who want a buffer. Repeating for quick reference:

buzzforb · 7th January 2012, 05:10 PM

Salas,
you ever tried Susy tube linestage? In the back of my mind, i am thinking that if this goes as well as expected, it might be cool to do dual mono version like john mcclaens balanced B1 or even simple Susy.

Salas · 7th January 2012, 05:14 PM

Susy, no. I have a single ended wired system anyway. So no opinion on that question.

buzzforb · 7th January 2012, 05:14 PM

FWIW, musicians friend is having sale om matched TungSol 6V6 for $35.

Salas · 7th January 2012, 05:16 PM

New from Saratov, or American NOS?

buzzforb · 7th January 2012, 05:35 PM

Unsure. Jusr got the notice.

stajo · 7th January 2012, 05:36 PM

Black anode. Cool, maybe I'll re-bread it to buffer while waiting for regulator stuff. Gonna tune and "compactisize" the filterlines to and work it out for two 340/360 lines, for with and without SSHV2. I have two old output trafos from old radios at about 11 H each that I think will take the current.

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7th January 2012, 04:49 PM	#341
stajo diyAudio Member Join Date: Jun 2011 Location: Stockholm	Well, here is the monster, with the scrap I had at home over the weekend. Foilcoated plank, pre-war caps, trafo and a 5Z3 for now. I made dual filters for trying out dual AZ1 or such later. Got 2,3 k in the filters plus chokes now, had 335 V B+. Behold the beauty Staffan

7th January 2012, 04:52 PM	#342
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Cool test preamp. Is it the gain version (common cathode) CCT? What make of tubes, and what heaters power scheme? P.S. You already wrote AC for heaters, OK.

7th January 2012, 05:02 PM	#343
stajo diyAudio Member Join Date: Jun 2011 Location: Stockholm	Yes, gain version. Were there a cathode follower to? Didnt see that. Tubes is old RCAs testing fair. Regular electrolytics as cathode resistor bypass, 1uF MKP output caps, resistors what I found around. Other then that, fairly as the schematic I found in this thread. Heaters power scheme? Regular AC 2 lines 6,3 VAC from the trafo. It has 5 V to. From an old radio. Staffan

7th January 2012, 05:10 PM	#345
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Salas, you ever tried Susy tube linestage? In the back of my mind, i am thinking that if this goes as well as expected, it might be cool to do dual mono version like john mcclaens balanced B1 or even simple Susy.

7th January 2012, 05:14 PM	#346
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Susy, no. I have a single ended wired system anyway. So no opinion on that question.

7th January 2012, 05:14 PM	#347
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	FWIW, musicians friend is having sale om matched TungSol 6V6 for $35.

7th January 2012, 05:16 PM	#348
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	New from Saratov, or American NOS?

7th January 2012, 05:35 PM	#349
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Unsure. Jusr got the notice.

7th January 2012, 05:36 PM	#350
stajo diyAudio Member Join Date: Jun 2011 Location: Stockholm	Black anode. Cool, maybe I'll re-bread it to buffer while waiting for regulator stuff. Gonna tune and "compactisize" the filterlines to and work it out for two 340/360 lines, for with and without SSHV2. I have two old output trafos from old radios at about 11 H each that I think will take the current.