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Post by woodyblues on Feb 18, 2023 12:23:39 GMT -5
There are many here on this forum with the knowledge and wisdom I wish I had. I'm hoping to tap into it again for a question about an old Roland Bolt 60 amp that's been gathering dust for years. It has a very cool cabinet, is 60watts using 6L6 tubes, but had in my opinion a lousy transistor preamp section. It has an effects loop and as I understand it sound would bypass the preamp section by just putting a line level signal into the return of the effects loop (if this is incorrect please feel free to let me know) thereby just using the tube output section. My preference in tube sound is the 6V6 variety and I am wondering if they can be used is some way with this amp instead of the 6L6's. I realize there would be less power and this is fine as the 60 watt capability of the amp as it stands is already too loud for my purposes.
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Post by Jim D. on Feb 18, 2023 13:22:01 GMT -5
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Post by Peegoo 🏁 on Feb 18, 2023 15:47:34 GMT -5
You'll need to rein in your voltages for the lower-powered 6V6, and a good way to do this is to find a schematic for an amp that has the exact same tube compliment as the amp you want to convert.
Some schematics show voltages and some do not; use one that has voltages listed.
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pdf64
Wholenote
Posts: 557
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Post by pdf64 on Feb 18, 2023 20:00:35 GMT -5
The bias supply voltage at least will need modding to suit 6V6. And it’s pretty much a safe bet that the amp would still going to be way too loud after conversion.
There’s generally an amplification stage required between an fx loop return and a valve power amp input. In your amp, it’s probably going to be a solid state stage.
All in all, I suggest to sell the amp and buy one that better suits your needs.
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Post by woodyblues on Feb 23, 2023 9:20:18 GMT -5
Thanks all for your valuable suggestions. This old amp always looked cool to me and the cabinet was very robust. Maybe the thing to do is get a "kit" deluxe and just build it inside this amp.
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