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 Post subject: Trip top and 6550
PostPosted: Thu Jan 03, 2019 8:46 pm 
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Joined: Thu Jan 03, 2019 8:44 pm
Posts: 1
Hi, I'd like to replace the 606GC with 6550.
What I need to change? R30 and R31 from 270k to 100k?


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 Post subject: Re: Trip top and 6550
PostPosted: Tue Jan 08, 2019 11:23 am 
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Holy Ghost
Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7255
Location: Brighton, Canada
You don't need to change R30/31 but you may need to change the bias range resistor R43 so you can set the Fixed bias correctly.
Same with the 500R 5W R34/35 if you plan to run in cathode bias mode. We haven't done this so you will need to CAREFULLY experiment.
I would think it would work with no mods but make sure you do the tests and calculations to determine the safe operating of the amp power tubes or get a tech to make the changes for you if you are concerned.
Keep us posted on your progress.

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