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In Reply to: RE: 2 stages High Power SE posted by Tube Tourist on January 23, 2012 at 20:54:46
Hello,Dowdy is a LONG TIME friend of mine, and I have had his amp, with Jim there, on my speakers in my living room.
I personally do NOT like a low or medium mu driver tube in a two stage amp, it makes it lifeless unless pushed hard to my ears.
You can triode connect a 7788 and pull off a big tube Finals amp OK, but if you really need that power, you have the wrong speakers, and /or should be using GOOD solid state, because it will outperform amateur builds I have seen. Overall, I prefer a 2A3 amp.
Jeff Medwin
Edits: 01/25/12Follow Ups:
What you mean by low and medium mu? 50 or 100 or higher?
The high mu driver (in a two stage amp) is dependent partialy upon the mu of the finals.
To have a lively sounding amp at low listening levels, with a mu equals 4 or 5 (typical DHT) as Finals, I like to see about a 70 mu to 100 mu front end tube.
If you use a mu of 20 tube, (of which there are many nice sounding tubes ), it will never have the JUMP factor that I like to have in a DHT amp.
I am not into tonally correct but lethargic amps. I do not want to only hear it correctly when the amp is pushed. I want the amp, for long term listening pleasure, to be tonally correct and as lively and vivacious as all get out.
I need an email from you so I can have an address to send you the new power supply design data.
Jeff Medwin
The D3A I am using has a Mu of 70 in triode & a low plate resistance of 1900 ohms. Also seems to be more stabile than a 6C45n. The Pete Millet site have some interesting test data on the D3A. It has remarkable low distortion.
I am surprised I never seen a schematic with a D3A direct driving a 2A3.
Jeff, I like privacy- no face book, twitter, only Linkedin due to business ralationships. I was a ham radio operator just so I could experiment legally with a transmitted signal. I rarely ever called CQ, CQ, CQ. I communicated via aurora on 6 meters for the most part. I only socialize with women as I HAVE to to have one or attend business meetings.
Thats fine on privacy, I surmised that, thats why I suggested email(or snail mail) to a third party. How can I do that??
You, of all people, should read the grouping of posts.
Jeff Medwin
I have two addictions- The scent of a clean woman & the smell of hot tubes playing music. I like a glass of wine, but if I could only chose two, the above stands.
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