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22nd May 2007, 11:44 AM
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#1 |
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diyAudio Member
Join Date: Jul 2002
Location: Perth
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has anyone used the 4-125A in SE amp ?
I have a collection of these valves, whilst i have an application for a push/pull amp i don't want to build it.
I would like to know if the valve is suited to single ended applications. |
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22nd May 2007, 01:00 PM
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#2 |
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diyAudio Member
Join Date: Jun 2004
Location: Cool end of a soldering iron NW of Toronto
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Best way to find out may be to try it. The high plate voltage (3000+) and low (400 IIRC) G2 voltage will be a problem in that you will need a separate G2 supply. I think I`d be tempted to tie both grids together and use as driving grid making a seldom employed triode connection. Gain will be low so large driver swing will be required if you go this route. The 4-125A looks very impressive all lit with plate glowing a dull orange at rated dissipation.
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