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Old 28th November 2006, 01:54 AM   #1361
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Quote:
Originally posted by yagoolar
Rrrrright. What do you suggest?

Can you mount a pushbutton on-off switch, or one that rotates behind the panel and make a wooden knob to actuate it that is a visual match to your other control on the far left? That would be a big improvement.
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Old 28th November 2006, 08:22 AM   #1362
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Quote:
Originally posted by rcavictim



Can you mount a pushbutton on-off switch, or one that rotates behind the panel and make a wooden knob to actuate it that is a visual match to your other control on the far left? That would be a big improvement.
That is what my first thought was. Thanks.
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Old 2nd December 2006, 04:37 AM   #1363
2004ex is offline 2004ex  United States
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Default YA aikido...

For the spirit of sharing (or just for the record), here is another aikido linestage with 6sn7/6sn7 octal board and a 3-switch attenuator, all from Tubecad.com. Passive-outs are added to the rear upper-left. It has an all aluminum case (fleamarket IBM research lab) and African rosewood trims, with rca jacks from partsconnexion. The knobs are from a fleamarket Grass medical research amp. Jensen and Auricap output caps are used. It has a 12.6V AC filament, +300V HV, no choke, plus a full-wave s.s. diode rectifier.
Very subjective listening impression - Semi-AB(?) compared to a McIntosh C20 preamp with treble and bass controls set to middle of the range. Same solid state amp and speakers were used. A 5 minute section of the Hilary Hahn, Natalie Zhu (Mozart violin sonatas) CD was played continuously for about 4 hours, with the two preamps switched at random times (not blindly as I did that by myself). Conclusion: Both sound very nice but the old C20 sounds a little bit more "refined (or warmer?)" - may be not all its shaping circuits were defeated, or the old (leaky?) components added a pleasant distortion to the sound. I would give the edge to the C20 at this point, at least for simple instrumental music. Projectwise, the main problem had been trying to reduced the hum of the aikido (posted at this forum before - http://www.diyaudio.com/forums/showt...945#post992945
). Conclusion - the aikido preamp is good and worth the effort.
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Old 2nd December 2006, 02:34 PM   #1364
coresta is offline coresta  France
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My DHT mono amp
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Old 3rd December 2006, 07:58 PM   #1365
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Here's my power amp.

It uses PT15 transmitter pentodes in triode mode

Drivers are RCA 6AC7 metal cased pentodes.
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Old 3rd December 2006, 08:08 PM   #1366
poynton is offline poynton  United Kingdom
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Click the image to open in full size.





WOW !!!



I, for one, would like to know more about this.
Post the circuit, please.

Andy
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Old 3rd December 2006, 08:32 PM   #1367
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Here's the circuit.

The drivers are loaded very low for a pentode so they swing
plenty of current into the grids of the PT15s.
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Old 4th December 2006, 10:35 PM   #1368
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One of my Maggies. Minor capacitor and reisistor replacements and a fuse with a good 3-prong. A sweet amp given it's low cost and relative abundance in the marketplace.
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Old 5th December 2006, 01:55 AM   #1369
miklos is offline miklos  Canada
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What's in the forfront?
Is it an EZ90?
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Old 5th December 2006, 01:59 AM   #1370
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6CA4
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