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Old 2nd February 2010, 04:27 PM   #1
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Default FS: DIY 150w KT88 amplifiers

Hi guys,

Over the years, and attending many DIY/audio gatherings, I have met several members looking for some higher powered tube amps. We had an addition to our household 10 months ago, and he is getting much closer to walking. As much as I enjoy my big tube amps, I'd hate to see my little one get hold of them. They are heavy and on the bottom shelf of my audio racks with 3/8" glass under them.

Anyway, I thought I'd start here and see if anyone is interested in them. These use 6 KT88s per monoblock, 1 6SL7 and 1 6SN7. Hammond 1650W OPTs, Antek 4T400 PT, separate filament trannys from triad, Hammond 193N chokes. There is a separate warm up switch to allow the filaments to come up before B+ and bias voltage. All switches are on the 12v side of the trannys, so you are not tossing a 120v switch on a 500v line. These amps use individual bias pots for each tube, and there is a box that plugs into the top plates to allow you to connect your meter and bias each tube separately by switching from tube to tube. If you are interested in these please feel free to email me, and I'll supply some pictures and answer any questions you have about them.

I have about $1,500 in parts in these, and that is also my asking price. No labor at all.

These sound fantastic, and anyone that has heard them can tell you that they deliver plenty of power for your inefficient speakers.

This is a copy and paste from a local audio group I attend, so that is why it opens regarding members.

I just figured I'd post them here as well. These will not ship (70lbs each!!), so anyone interested in these, please PM me. I'm willing to negotiate a trip to meet you if you are close enough. I'm in McKinney, TX 75069.

Please PM me for additional info and pictures.

Thank you!

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Old 2nd February 2010, 05:37 PM   #2
john65b is offline john65b  United States
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Do you have a schematic?
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Old 2nd February 2010, 06:12 PM   #3
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I have a few bits and pieces I used to build them. I'll have to look for them. I never completed a final schematic. I'm going to attach one, but ignore the bias circuit since it was just dropped in to symbolize the circuit. It has a few more components. Some of the values in this schematic may have been changed as well.

If someone is interested in purchasing these, I'll take the time to draw the proper schematic, but it would be too time comsuming just to do for fun.

Hope this helps.

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Old 3rd February 2010, 02:29 PM   #4
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Bump, and price drop $1,250 in realization that I'm not willing to ship and this is an inconvenience.

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Old 4th February 2010, 01:50 PM   #5
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Here are a few pictures just in case anyone is interested.





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Old 4th February 2010, 10:56 PM   #6
Glowbug is offline Glowbug  United States
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Sent you a PM...just in case
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