Will this work? "Mixed" 300B PPP IT - diyAudio
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Old 24th April 2004, 03:08 PM   #1
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Default Will this work? "Mixed" 300B PPP IT

Will this work? the driver tubes are either ECC99 or 6C45's.... Phase splitter is a Sowter 8920 Transformer. Each phase of the driver stage is IT coupled to two paralleled 300B output tubes via a Lundahl 1660 transformer in SE to SE configuration.

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Old 24th April 2004, 03:45 PM   #2
Fuling is offline Fuling  Sweden
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I can´t see any reason why it wouldn´t work, but is there a point in this concept?
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Old 24th April 2004, 03:46 PM   #3
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Why to be different of course!
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Old 24th April 2004, 03:49 PM   #4
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No, no point... except for re-using parts that I already have... and to be different off course...
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Old 24th April 2004, 05:29 PM   #5
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A cautionary note: with simple cathode bias, the 4 "finals" have to be CLOSELY matched. Obtaining CLOSELY matched quads of 300Bs could be quite difficult.

Implementing Dennis Boyle's combination bias would provide a means by which imperfectly matched tubes are compenstated for.

Use unbypassed 220 Ohm cathode resistors "under" each "final". A bias supply combined with 4X individual bias adj. pots. allows the setting of the "finals" at identical idle currents.
Eli D.
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