RE: 6SN-7's - Lew - OTL Asylum

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

RE: 6SN-7's

In Reply to: 6SN-7's posted by throwback on December 28, 2014 at 07:18:11:

Hi Chuck, Happy New Year to you, too. Probably the best person to consult on which tube does what would be Ralph, since there are so many iterations of the MA1. Two of the tubes (and I do not know which two on your amplifier) comprise a dual-differential cascode input stage. Those would be the two most important tubes in terms of an effect on sonics. One of the other three is probably serving as a Constant Current Source for the dual-differential cascode. And the remaining two tubes are either both drivers for the array of output tubes, or only one is the driver tube and the other serves as a CCS for it.

You could in fact identify the two tubes that form the input stage (the dual-diff cascode) by flipping your amplifier over and removing the bottom plate. Then look to see which tube receives the wires from the XLR input jack. That one will be the "bottom" tube in the cascode. The upper tube in the cascode should be right next door with many wires going between it and the lower tube of the cascode. But better for Ralph to just tell you in terms of "V1, V2, etc."

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Follow Ups Full Thread

Topic - 6SN-7's - throwback 07:18:11 12/28/14 (16)

Tung-Sol roundplates! I'm quite late to this discussion, and you've probably done... - jeffreybehr 16:33:34 03/21/16 (0)

RE: 6SN-7's - throwback 20:24:09 01/04/15 (7)

RE: 6SN-7's - throwback 07:39:39 01/05/15 (3)

RE: 6SN-7's - Catastrofe 05:20:23 01/07/15 (1)

6SN-7's, do you own an Amplitrex Tube Tester? - Cousin Billy 05:25:36 01/20/15 (0)

RE: 6SN-7's - Lew 07:51:55 01/05/15 (0)

RE: 6SN-7's - Lew 07:24:22 01/05/15 (0)

RE: 6SN-7's - Cousin Billy 04:04:23 01/05/15 (1)

Quick ebay search - Cousin Billy 05:14:20 01/05/15 (0)

If you have a 5-driver-tube MA-1 - Ralph 12:06:40 12/31/14 (5)

RE: If you have a 5-driver-tube MA-1 - MP 06:44:51 09/09/23 (0)

RE: If you have a 5-driver-tube MA-1 - throwback 10:19:03 01/04/15 (0)

RE: If you have a 5-driver-tube MA-1 - Banat 09:09:22 01/01/15 (2)

Hi, Banat…. - Lew 08:19:08 01/02/15 (1)

RE: Hi, Lew - Banat 12:38:07 01/02/15 (0)

RE: 6SN-7's - Lew 20:30:21 12/28/14 (0)

Follow Ups

RE: 6SN-7's - Lew 20:30:21 12/28/14 (0)

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