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Old 7th January 2012, 04:49 PM   #341
stajo is offline stajo  Sweden
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Well, here is the monster, with the scrap I had at home over the weekend.

Click the image to open in full size.

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
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Old 7th January 2012, 04:52 PM   #342
Salas is offline Salas  Greece
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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.
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Old 7th January 2012, 05:02 PM   #343
stajo is offline stajo  Sweden
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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
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Old 7th January 2012, 05:06 PM   #344
Salas is offline Salas  Greece
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RCAs are great. Black anode? Yes there was a bootstrapped cathode follower also shown for those who want a buffer. Repeating for quick reference:
Attached Images
File Type: gif 6V6CF.gif (6.9 KB, 397 views)
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Old 7th January 2012, 05:10 PM   #345
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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.
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Old 7th January 2012, 05:14 PM   #346
Salas is offline Salas  Greece
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Susy, no. I have a single ended wired system anyway. So no opinion on that question.
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Old 7th January 2012, 05:14 PM   #347
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FWIW, musicians friend is having sale om matched TungSol 6V6 for $35.
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Old 7th January 2012, 05:16 PM   #348
Salas is offline Salas  Greece
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New from Saratov, or American NOS?
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Old 7th January 2012, 05:35 PM   #349
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Unsure. Jusr got the notice.
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Old 7th January 2012, 05:36 PM   #350
stajo is offline stajo  Sweden
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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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