steve
Rank: Trio
Posts: 206 
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Post by steve on May 20, 2016 20:49:58 GMT
Proud to be Made in Britain! Aye... the whole transformer set is British made, courtesy of Danbury Electronics. |
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steve
Rank: Trio
Posts: 206
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Post by steve on May 21, 2016 14:19:55 GMT
Mono 2 power supply is built and on soak test.  |
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steve
Rank: Trio
Posts: 206
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Post by steve on May 22, 2016 11:16:47 GMT
Output stage negative grid bias supply 1 is completed and tested.  Bias supply for the other monoblock next. |
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steve
Rank: Trio
Posts: 206
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Post by steve on May 22, 2016 14:14:08 GMT
......followed a little later by no 2:  |
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Post by Sovereign on May 22, 2016 15:19:45 GMT
Looks like things are progressing nicely Steve
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steve
Rank: Trio
Posts: 206
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Post by steve on May 22, 2016 19:30:29 GMT
Aye...steady.
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Post by Greg on May 22, 2016 20:25:55 GMT
And he's composing songs as he builds, mad buggar!   |
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steve
Rank: Trio
Posts: 206
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Post by steve on May 27, 2016 18:32:33 GMT
Here is the latest progress shot. This is the underside of amp 1, showing the wiring almost finished. It just needs the regulator board for the input pentode screen grids to be installed and the XLR input wiring putting in. Amp 1 can then be tested and brought into service.  |
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steve
Rank: Trio
Posts: 206
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Post by steve on May 28, 2016 17:54:26 GMT
After cueing up a few mono records we have music :lol:  It all worked perfectly from the off. All voltages within spec and no smoke. After adjusting the screen grid balance control of the input stage so that each side of the cathode follower driver was outputting the same DC voltage and biasing and balancing the output stage, we were off and running. Niiiiiiiice  The other amp should be operational in a couple of days. |
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Post by MartinT on May 28, 2016 19:30:47 GMT
Cracking - well done!
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Post by ChrisB on May 28, 2016 19:38:07 GMT
Very nice.
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Post by Sovereign on May 29, 2016 14:44:17 GMT
After cueing up a few mono records we have music :lol: It all worked perfectly from the off. All voltages within spec and no smoke. After adjusting the screen grid balance control of the input stage so that each side of the cathode follower driver was outputting the same DC voltage and biasing and balancing the output stage, we were off and running. Niiiiiiiice The other amp should be operational in a couple of days. Fantastic , well done |
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steve
Rank: Trio
Posts: 206
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Post by steve on May 29, 2016 17:18:45 GMT
Cheers chaps, Amp no2 should be all done tomorrow. Photo shows amp 2 output stage and screen voltage regulator completed, bias board mounted etc:  It's been rather a large undertaking, but we're nearly there. |
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Post by Firebottle on May 30, 2016 7:41:33 GMT
Glorious point to point construction. Well done sir.
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Post by speedysteve on May 30, 2016 10:44:08 GMT
Looking fantastic. Very nice work.
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steve
Rank: Trio
Posts: 206
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Post by steve on May 30, 2016 16:59:36 GMT
Thanks for the positive comments guys. Amp 2 is finished, tested, biased up and working:  Just need now to make the bases and fit some feet, but I'll be having a bit of fun later on, trying the pair out in the system, with some music. I sense a late night ahead. |
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steve
Rank: Trio
Posts: 206
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Post by steve on May 30, 2016 17:59:38 GMT
And here are both monos playing via the BTE, Sowter phase-splitting transformer equipped passive balanced preamp, built by my son, which can be seen on top of the DAC, behind the right hand amplifier.  At the moment,they are fitted with Electro-Harmonix 6CA7EH output valves. I'm going to enjoy getting to know these amps this evening |
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Post by MartinT on May 30, 2016 19:45:08 GMT
Great build, Steve. Enjoy your listen!
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Post by MikeMusic on May 31, 2016 14:38:01 GMT
Brilliant Steve
So far above my capability
Enjoy the music
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steve
Rank: Trio
Posts: 206
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Post by steve on Jun 1, 2016 11:05:11 GMT
Cheers chaps, The amps are now fitted with proper feet and are in their new home and playing:  |
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