How to exchange the GU74b / 4CX800 tubes on your Alpha91b (Alpha99) Amplifier
JTG Built GU74B (4cx800) Steel Tube Linear Amplifier (Tetrode) 220v - YouTube
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Tested! NEW tube GU-74B (GU74B GU 74B) Equivalent of 4CX800A | eBay
How to exchange the GU74b / 4CX800 tubes on your Alpha91b (Alpha99) Amplifier
GU-74B GU74B GU74-B / 4CX800A Tetrode Tube 0.6kW NOS | #247912788
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NOS Russian Svetlana TUBE GU-74B / GU74B / 4CX800A TETRODE tested by ACOM | eBay
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1 X GU-74B = 4CX800A 4CX-800A SVETLANA TETRODE NEW TESTED TUBE OTK NOS #32 $189.95 - PicClick
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GU-74B USED TESTED 4CX800A tetrode Tube GU74B $270.00 - PicClick
Lot of 2 pcs. NEW tube GU-74B (GU74B GU 74B) Equivalent of 4CX800A | eBay
JTG Built Steel- Dual 4cx800 GU74B Linear Amplifier - YouTube
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