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'Gain Pot'
Author:michaeleinem (guest: search)
Date: Tue, Feb 19th, 2008 @ 16:11 ( . )

Mind the load if you are going to use a EL34.
It's not just the bias. EL84 and 6V6 require a primary reflected impedance of about 5k.
The EL34 on the other hand needs only 2k. This means that if you insert an EL34, you need to dial in an approximate tap on the OT.

For example: 8 Ohm speaker, 4,8,16 Ohm tap on OT.
With an EL84 or 6V6 you need to select the 8 Ohm tap on the OT.
With an EL34 you should select the 16 Ohm tap.
This will reflect about 2,6K into the primary instead of 5,2K which is much closer to the optimal 2K.

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Replies:
--* Gain Pot
2/19/2008 @ 16:30--Gonzalo
2/20/2008 @ 02:18----michaeleinem
2/19/2008 @ 16:45--VanR
2/19/2008 @ 16:55----michaeleinem
2/19/2008 @ 17:02------Mick S
2/20/2008 @ 02:10--------michaeleinem
2/20/2008 @ 10:21----------Mick S
2/19/2008 @ 17:24------ogorir
2/20/2008 @ 03:18--------Zoe N Iain
2/20/2008 @ 07:12----------ogorir
2/20/2008 @ 00:53--elac oval
2/20/2008 @ 02:03----michaeleinem
2/20/2008 @ 19:07------Gonzalo
2/21/2008 @ 02:14--------michaeleinem

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