[sdiy] Possibly OT Tube Amplifier Question

sasami at blaze.net.au sasami at blaze.net.au
Thu Apr 12 09:41:00 CEST 2001


Try triode electronics pages. Specifically: 
Quick fixes for 7591A amps http://www.triodeel.com/7591.htm
Also look around other parts of their site because they 
discuss Ampegs specifically, due to voltages used in the 
Ampegs.

Ken

>Does it count as "on topic" if I want to use the amp
>with a synth?  <grin>.
>
>Anyway, it's an Ampeg J12R Reverbojet.  It's output stage
>is bad (uh, sockets are partially melted).  I've thought 
>about rebuilding it using matched 6L6 tubes (I have them), 
>but I've been told that it may require resistor changes.  
>I have the schematic, but I honestly don't know enough 
>about tubes to re-engineer the circuit.  The original 
>output tubes are 7591.  Both the 7591 and 6L6 are tetrode 
>power types, the 6L6 being a little less powerful.  I chose 
>6L6 because I couldn't (at that time) find any type 7591.  
>Perhaps I don't know where to look for replacement tubes.  
>I wouldn't mind just putting it back to normal.
>
>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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>




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