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RT503 HELp PLEAAAAASEEEE EASY NOOBISH QUESTION

 
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raed666
RM20


Joined: 22 Jan 2012
Posts: 4

PostPosted: Thu Jul 05, 2012 11:40 am    Post subject: RT503 HELp PLEAAAAASEEEE EASY NOOBISH QUESTION Reply with quote

Hi, I have randall RT503H And would really appreciate your help on this, What is the preamp tubes schematics for this head, I want to use the power amp section with an external preamp, bypassing the head's preamp section using the 4 cable method, the thing is i need to know whcih of the 5 preamp tubes are the phase inverter and the FX preamp tubes, just to remove the other 3 tubes for the Ch.1,Ch.2,Ch.3,,,just not to end up with dead preamp tubes in the head (will this also may hurt my amp)?? Much Thanks!!!!!!
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Rod
Lynch Box


Joined: 11 Sep 2009
Posts: 1034
Location: Seacoast NH/Southern Maine

PostPosted: Sun Sep 30, 2012 1:59 pm    Post subject: Reply with quote

Don't pull out tubes you are not going to be using....
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zepplin490
Lynch Box


Joined: 01 Jun 2012
Posts: 839
Location: Bucksport Maine

PostPosted: Sat Jun 29, 2013 8:30 pm    Post subject: Reply with quote

You dont need to use the 4CM or frig around with the tubes to bypass the preamp and use it as a power am just run the output of your preamp into the loop return and you'll be good to go, Ive used my RM4 through a bunch of different amps this way.
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