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Post by pre65 on Feb 20, 2015 16:16:22 GMT
I've been revamping the power supply on my GK-71 valve amp making it dual mono to match the amps themselves.
It's not very pretty (  ) with the amp perched on top of each PSU, but it (they) now take up less floor space. 
The GK-71 is configured in triode mode so is similar to the GM-70 triode.
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Post by John on Feb 20, 2015 16:26:15 GMT
Looks a good build Must of been a lot of hours making them
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Post by pre65 on Feb 20, 2015 16:32:21 GMT
Looks a good build Must of been a lot of hours making them
I used several bits from my 833a mega amps, so they are now in the queue for upgrading. HT is being raise from 950v to somewhere about 1350v with new transformers and chokes, with the PSU caps now in banks of 4. (each cap rated at 450V).
But I need to get my classic scramblers prepared first as the new season starts in four weeks time. |
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Post by MartinT on Feb 20, 2015 16:37:37 GMT
Nice build and great pride of ownership, I'm sure.
How do they sound compared with the 833s?
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Post by pre65 on Feb 20, 2015 16:40:57 GMT
Nice build and great pride of ownership, I'm sure. How do they sound compared with the 833s?
I'll tell you more when the 833a rebuild is complete, but it will be a while.  |
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Post by danielquinn on Feb 20, 2015 16:41:18 GMT
1350v , can i bring my children round to play with them |
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Post by pre65 on Feb 20, 2015 16:43:25 GMT
1350v , can i bring my children round to play with them No ! Children and animals are banned at chez pre65.  |
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Post by danielquinn on Feb 20, 2015 16:45:56 GMT
They would have to be or they would be dead in 5 minutes  That is strictly a mans hifi . |
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Post by Sovereign on Feb 20, 2015 16:49:04 GMT
What are the speakers ?
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Post by istari_knight on Feb 20, 2015 16:54:50 GMT
Some iron you've got there !
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Post by pre65 on Feb 20, 2015 16:56:24 GMT
Open baffles with an 18" Fane (15 ohm) and a Fostex FE167E with a series crossover.  |
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DIY Amps.
Feb 20, 2015 17:19:57 GMT
via mobile
Post by Sovereign on Feb 20, 2015 17:19:57 GMT
Fantastic, open baffles are the way to go in my opinion.
I'm about to start a major speaker re build next week.
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Post by John on Feb 20, 2015 18:04:06 GMT
Another Open Baffle fan
James look forward to reading your build
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Post by Greg on Feb 20, 2015 18:25:54 GMT
Couldn't have them in my house. Not a concentric pair!  ? Now you go careful with those scramblers. You really are an old man now, you know. Hip replacements are just over the horizon! All joking aside, they look great Philip. I hope to hear them at the next Owston. Don't let anyone tell you they are shoddy! |
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Deleted
Deleted Member
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Post by Deleted on Feb 20, 2015 18:53:11 GMT
I'm not sure if it matters to you but your pics link to your entire bucket. You might not want everyone to see all your pics.
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Post by jazzbones on Feb 21, 2015 12:45:02 GMT
1350v , can i bring my children round to play with them No ! Children and animals are banned at chez pre65. I would say definitely not... just go on your own |
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Post by Paul Barker on Feb 21, 2015 13:15:04 GMT
No they aren't shoddy ? I too am worried about Phil's pastimes. |
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Post by Paul Barker on Feb 21, 2015 13:19:10 GMT
They would have to be or they would be dead in 5 minutes That is strictly a mans hifi . When Phil first started this hobby he dived in the deep. End far too quick, a number of us behind his back used to share a serious concern over his safety. But he seems to have 9 lives. He is a great contributor to the day valve amp scratch build fraternity. We love him. He is very thick skinned and tends not to take offence no matter how much we try offending him. |
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steve
Rank: Trio
Posts: 206 
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Post by steve on Feb 21, 2015 21:03:29 GMT
Oh yes I remember. Please Phil watch those 845 HT voltages ferchrissakes! Ferfooksake come away from that cap bank! I've yet to venture above 500V |
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Post by Sovereign on Mar 1, 2015 11:14:35 GMT
Really interested in your amps Phil. I have been reading your thread on this amp www.world-designs.co.uk/forum/showthread.php?p=83066The DIY bug has bitten hard, and at some point I would like to attempt a power amp build and I'm at the very early stage of looking for an amp to build. You make no mention to the sound of the amp, can you comment more here, thanks. |
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) with the amp perched on top of each PSU, but it (they) now take up less floor space. 
?
