RE: your thought on this please . single GZ34 vs 2 x EZ81 parralell for preamp duty

From my experiences listening in 2013, with high mu tubes as would be used in a preamp ( but in my case, an amp ) I would DEFINITELY avoid paralleling sections.

Use one high powered dual rectifier tube.

I like "directly heated" ones, and would FIRST try a new production JJ 5U4G in that rectifier spot !! PSUD2 it. Possibly listen to a higher Z 5R4 with a bigger drop of B+. No paralleling of rectifiers with high mu tubes, skewed the sonics to my ears, screwed up diction and enunciation slightly, and others who did similar tests concur.

Use a big SINGLE rectifier tube and a BIG high current rated power transformer.

'Ever look at a 1970's ARC SP3 power trannie, which has stood the test of time? No tiny dude, like a Dynaco PAS-3 at all. The 1970s ARC D-75 power trannie was about 8 Ohms DCR on its HV winding too !!! William Z KNEW !! Everyone skrimps and barely gets by !! They, I"M"HO, do not understand !!

Jeff Medwin

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Follow Ups Full Thread

Topic - your thought on this please . single GZ34 vs 2 x EZ81 parralell for preamp duty - lovetube 00:33:35 07/21/14 (16)

6CJ3 - Mike C 13:56:15 07/25/14 (0)

Get some European mesh plate rectifiers for a preamp - andy evans 03:55:57 07/22/14 (3)

Can you provide more info? - Lew 10:26:40 07/22/14 (2)

info - Jim Dowdy 08:01:47 07/24/14 (0)

Should be on the web, but here's some pointers - andy evans 11:22:06 07/22/14 (0)

RE: your thought on this please . single GZ34 vs 2 x EZ81 parralell for preamp duty - Salectric 13:19:48 07/21/14 (1)

RE: your thought on this please . single GZ34 vs 2 x EZ81 parralell for preamp duty - drlowmu 16:28:21 07/22/14 (0)

RE: your thought on this please . single GZ34 vs 2 x EZ81 parralell for preamp duty - drlowmu 06:55:18 07/21/14 (0)

What is your current draw? - Chip647 05:35:52 07/21/14 (7)

RE: What is your current draw? - lovetube 06:25:55 07/21/14 (6)

Are you sure about that total current draw? - FenderLover 07:39:34 07/21/14 (0)

RE: What is your current draw? - Thomas Mayer 06:50:34 07/21/14 (4)

RE: What is your current draw? - lovetube 17:39:28 07/21/14 (3)

RE: What is your current draw? - Thomas Mayer 08:51:42 07/22/14 (2)

I agree with this - Ray Moth 15:29:04 07/23/14 (1)

Ditto ... - Naz 23:24:08 07/29/14 (0)

Follow Ups

RE: your thought on this please . single GZ34 vs 2 x EZ81 parralell for preamp duty - drlowmu 06:55:18 07/21/14 (0)

RE: your thought on this please . single GZ34 vs 2 x EZ81 parralell for preamp duty

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