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Post subject: 6550 instead of 6l6GC - Bassman 135
Posted: Wed Jan 05, 2011 6:59 am
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So I have this vintage beast Bassman 135. Love the sound, but some more headroom would be nice. I was considering swapping 6l6GC that are sitting there already for 6550. Do I need to make any mods to the amp? Or is it just drop-in swap?

Thanks for help


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Post subject: Re: 6550 instead of 6l6GC - Bassman 135
Posted: Wed Jan 05, 2011 3:31 pm
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As far as I remember, KT88/6650 are not equivalent to 5881WXT/6L6GC. For instance, heater current is 1.6A with the 6650A GE and 0,9 A with 6L6CG SED, you risk your supply transfo. Also the impedance for the output transfo should be different. My advice is to contact a tech.
There are so much choice on 6L6GC ...

Some mistake comes to the fact that on certain Marshall the EL34s were replaced by 6650 but it was a particularity of a local production with adapted components I believe.
8)

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Post subject: Re: 6550 instead of 6l6GC - Bassman 135
Posted: Fri Jan 07, 2011 2:25 am
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Thanks. Yes, I talked to the tech guy, he gave me almost the same answer, but he also said it might be possible, with minimal mods to the amp. Thanks again.


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