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RE: How can I get the magic of McIntosh MI-200 amps

162.231.200.70

bcguitar

In Reply to: RE: How can I get the magic of McIntosh MI-200 amps posted by Paul Joppa on October 23, 2014 at 16:28:02

Thanks Paul, that helps some. Does someone make an amp with these attributes that you know of?

Follow Ups:

RE: How can I get the magic of McIntosh MI-200 amps - Paul Joppa 17:47:51 10/26/14 (0)
"Does someone make an amp with these attributes that you know of?"

Not really - though I am not familiar with everything on the market!

John Tucker once made a shunt-regulated parafeed 45 using the Magnequest TFA-2004 output transformer, which will handle 20 watts at 30Hz - seems like overkill but it sounded fantastic. But that's a 3K impedance which is too low for the low distortion I was thinking about; I'd want 5K or so.

When I suggested a plate choke, it was to enable a high plate voltage - the power supply for a 45 will be around 350vDC. The 5842 (also mentioned) is not suitable because it has an absolute maximum of 200 volts.

Frankly I have not heard an interstage that sounds good enough, but in theory it does allow for the higher driver plate voltage.

Someone mentioned the design I am (slowly!) working on; it will not meet all the criteria I have suggested above - my comments were just a theoretical exercise to address the specific interests of the OP.

Someone also mentioned direct coupling, which does indeed sound wonderful. However, the difficulty in achieving and maintaining the operating points is so great a problem that I am avoiding it these days; I'd rather spend some money on really really good caps.
sounds like an interstage coupled 5842 ... cathode led... clean, fast, quiet etc~nT - Cleantimestream 19:14:19 10/25/14 (3)
~!
The Mind has No Firewall~ U.S. Army War College.
- RE: sounds like an interstage coupled 5842 ... cathode led... clean, fast, quiet etc~nT - bcguitar 07:30:44 10/26/14 (2)
  Finally an actual answer, thank you cleantimestream!
  - RE: sounds like an interstage coupled 5842 ... cathode led... clean, fast, quiet etc~nT - Cleantimestream 12:57:30 10/26/14 (1)
    Paul gave you an excellent answer of design goals that will net the 'traits' you made mention you favor... is quite difficult {in Paul's position as a manufacturer} as even an altruistic answer 'may' be construed as a ploy for his own wares. Paul {so far as I am concerned} possesses dignity incapable of such unscrupulous behavior. I, however am just another DIY lughead out there having fun.
    The Mind has No Firewall~ U.S. Army War College.
    - oh yeah, you are right, I was thinking he posted in another - bcguitar 15:20:16 10/26/14 (0)
      one of my posts in one of the other forums about the same topic.
RE: How can I get the magic of McIntosh MI-200 amps - dth31 09:13:17 10/25/14 (0)
Paul is working on one, but we've been trying not to bug him too much :)

http://bottlehead.com/smf/index.php?topic=3000.msg67512#new

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