Parellel MK3's for 120 watts?

for Dynaco Mark II/III/IV and DIY PP monoblocks

Parellel MK3's for 120 watts?

Postby kimbob » Fri May 09, 2008 3:19 pm

has anyone here tried to operate a pair of Mark3's in tandem or parellel to up the wattage to 120 watts or so?
Last edited by kimbob on Wed Jul 09, 2008 6:25 am, edited 1 time in total.
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Postby audiowize » Tue Jun 17, 2008 1:18 pm

I ended up using the Poseidon boards to drive a pair of 829B tubes per channel, although I didn't quite get up to 120 watts. You might consider a fresh chassis (pair of chassis is more likely) to obtain this goal instead of bridging two monoblocks. I used 829B's for their availability and resonable price point. An 829b is roughly two 807's in a single tube. In fact, if you used four 807's per channel, you could easily reach your power goal. You'll get a very satisfactory result starting with the proper output transformers/power transformers to get the job done.
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829b

Postby kimbob » Tue Jun 17, 2008 3:03 pm

Hi, Thanks for the info! I have been looking around at starting from scratch, where could i find schematics, specs etc on building a pair of these 829b power amps? I'm off to look up the tube data on these. Thanks much, Kim
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829b

Postby kimbob » Fri Jun 20, 2008 2:44 pm

That is one cool looking tube! Very interesting pinout.
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Postby speakerfritz » Mon Aug 11, 2008 7:18 am

If your interested in a dynaco 120 watt design, you can review the mark6 schematic. Origially intended for 8417's but can be adapted for kt88/6550.

Also Plenty of marshall schematics on the net for 100watt and 200watt tube amps (major 1966, major 1967, major 1978 models).
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BIG amps

Postby kimbob » Mon Aug 11, 2008 7:39 am

Hey, thanks for the info on these amps. I am building my big power amps using the transformers from a pair of old pa amps. I use 6- 6550's for each amp using very low idle current, driven by a 12AT7 & 12AX7. Very low distortion up to 180watts. They are up & running now, still tweeking some values. This is a Bob Carver design. I will post pics if i can ever find a way to upload one on this site. Kimbob
Last edited by kimbob on Mon Aug 18, 2008 4:41 pm, edited 1 time in total.
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Postby speakerfritz » Mon Aug 11, 2008 8:51 am

sounds like your making big time progress. I would be interested in reviewing the schematic your using.
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photos of my amps

Postby kimbob » Thu Aug 14, 2008 5:35 am

I uploaded photos of my amps at http://s537.photobucket.com/albums/ff331/brett37095/ I do not have permission to share or post the schematics, i will ask about this. I got a little carried away with 5 watt metal oxides. The caps are under the board, 7-390uf. They really sound great, but now i need to get speakers that will take it, my klipsch fortes sure are tough though. The drivers are 12AT7 & 12AX7. The 7 pin tube is a 6AL5.
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Postby Ty_Bower » Thu Aug 14, 2008 5:45 am

Wow. That's a whole lotta amp.
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Postby skidave » Thu Aug 14, 2008 8:10 pm

Nice Job! I would like to demo that on my Magneplanars.

Where is the enclosure from?

Any info on the schematic...you said you were not sure if you could post?

Dave
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Postby Scott Anderson » Thu Sep 18, 2008 1:36 pm

I built a 120 watt tube bass amp. I'm thinking of replacing the 6AN8 driver with the Poseidon board.

http://home.triad.rr.com/scottvicki/150BassAmpProject.htm

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6AN8 driver

Postby kimbob » Thu Sep 18, 2008 3:47 pm

Hi Scott, Nice work. I've been curious about the kt90's. I do not have enough experiance with guitar amps to know if the posieden would get the sound you want. I do know that I don't like the sound of the 6AN8 in hifi applications. I'm sure someone around here would know. Did you get your chassis & cage from antique audio? I bought from them too & they do have high shipping & handling. My chassis are hammond, they are ok, but the spot welds show. Another good supplier is www.mouser.com Great for resistors,caps,terminals,boards etc. Kimbob
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