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Old 18th March 2012, 08:41 AM   #21
multi is offline multi  Australia
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The 805 and 833 don't need huge voltages to run. Nobu k Shishido found they are best run at about 800 volts and 100-135 ma. Nobu used a 3.5k out put transformer in his amps for the 805.
I have made both Se And PP using the 805; I used 5k for the PP
If you can't afford inter-stage transformers you can use a Cathode follower such as a 6BL7.
The ming Da uses only 750 volts for 40-50 watts.
Phil
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Old 18th March 2012, 10:05 AM   #22
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Quote:
Originally Posted by multi View Post
The 805 and 833 don't need huge voltages to run. Nobu k Shishido found they are best run at about 800 volts and 100-135 ma. Nobu used a 3.5k out put transformer in his amps for the 805.
I have made both Se And PP using the 805; I used 5k for the PP
If you can't afford inter-stage transformers you can use a Cathode follower such as a 6BL7.
The ming Da uses only 750 volts for 40-50 watts.
Phil
Thanks for these details.
Lampizator site inform the Ming-Da MC3008A (805 mononlock) use B+=900V, the 300B drive seems 60mA, for stated 40W, the ASL is specified in excess of 50W.
ming-da Scrool down the page.
I unaware the Ming-Da 805 OPT secondary impedance, but it could be nice to know.
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Old 18th March 2012, 04:45 PM   #23
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Quote:
Originally Posted by multi View Post
The 805 and 833 don't need huge voltages to run. Nobu k Shishido found they are best run at about 800 volts and 100-135 ma. Nobu used a 3.5k out put transformer in his amps for the 805.
I have made both Se And PP using the 805; I used 5k for the PP
If you can't afford inter-stage transformers you can use a Cathode follower such as a 6BL7.
The ming Da uses only 750 volts for 40-50 watts.
Phil
can you tell something more about the amp you made ith 805 ?
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Old 18th March 2012, 07:40 PM   #24
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I mean say Primary Impedance.
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Old 23rd March 2012, 05:25 AM   #25
multi is offline multi  Australia
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Default Nobu. K. Shishido 805

Nobu design for the 805 SE; he claims 45 watts for the 805 and 35 watts for the 838 {no top cap} with driver transformers.
Out put transformer 3.5K.
I have built 805's using about 800 volts, but driving them using 6BL7's as cathode followers, for the voltage amps I used Mu followers running at 750 volts, using 6AQ8's. A friend of mine has built the amps using driver transformers and Cathode followers, he prefers the sound of the Cathode followers.
Phil
Attached Images
File Type: jpg 805.jpg (191.6 KB, 236 views)
File Type: jpg 805 WE-437A.jpg (222.7 KB, 224 views)
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Old 9th June 2014, 02:27 AM   #26
multi is offline multi  Australia
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Default 833 Se Amp 572 SE

833 Se amp
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File Type: gif ps833nynoise.gif (3.5 KB, 62 views)
File Type: gif se833nynoise.gif (6.9 KB, 61 views)
File Type: jpg sesv572-160.jpg (62.9 KB, 63 views)
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