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Old 29th February 2008, 08:16 PM   #1
lpd is offline lpd  Canada
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Default Quicksilver conversion

How does this conversion form 8417's to 6550/KT88's look?

conversion
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Old 1st March 2008, 05:06 PM   #2
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It looks good I've converted 1/2 dozen of them so far.

I would also modify the bias to allow for individual tube adjustment.
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Old 3rd March 2008, 03:10 AM   #3
lpd is offline lpd  Canada
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I thinking of converting a pair of Bogen MO-100A's to KT-88's. Four per channel, rebuild the front end, individual bias pots for each tube, triode/ultra linear switch.

Looks like a great candidate for medium power tube amp? Here's the schematic. Any thoughts?

Schematic
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Old 3rd March 2008, 10:32 AM   #4
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Commercial 70 volt power amplifiers aren't really known for their low end so I wouldn't expect too much there. Actually it will run 6550's or KT88's the way it is. I have heard Bogans that people have just popped in some different output tubes and they sounded ok. I would loose the input transformer and the music/speech switch if it were me. If you wanted you could copy the Quicksilver which would allow you to use the easier found front end tubes.

The 8417 Quicksilvers will also work fine without changing the front end. A bias upgrade however I would highly recommend.
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Old 3rd March 2008, 03:11 PM   #5
lpd is offline lpd  Canada
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What about the MO-100's? Look identical to the Quicksilver 8714 mono blocks to me or very close. I have access to a pair of these as well. I'm thinking of using the utility 9 pin socket for another stage of gain. These use 6550's of coarse, but look very similar to the Quickies.

shematic
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Old 4th March 2008, 10:38 AM   #6
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Why do you need another stage of gain on the MO-100?

I like the MO-100A chassis the best and it is fine with small modifications. Change the bias circuit and loose the speach/music switch and the input transformer.
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