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In Reply to: RE: Are you telling him to add these chokes or replace parts? posted by Chip647 on October 03, 2014 at 13:56:38
Chip,You don't know it, but you just described the best amp I have ever heard on high efficiency speakers. Its a shame you have never heard one, and its more of a shame that you only talk on a theoretical basis.
Where do you live in the USA, maybe I can get you to hear one of these amps so you will begin to know what I am talking about.
You can't hear a DHT amp properly until it has 20 Ohms or less chokes, period.
Jeff Medwin
Edits: 10/04/14Follow Ups:
"You can't hear a DHT amp properly until it has 20 Ohms or less chokes, period."
Absolutes are a funny thing. Isn't it the ratio of the power supply DCR to the plate impedance of the output tube that counts? If one runs a DHT output tube with 8k Rp, then a 600ohm power supply ought to be just dandy, no? That's what I find - my 833C amps are extremely dynamic, even with their 600R power supply.
Perhaps you ought to qualify that statement to include low Rp output tubes?
The move from an 811 to an 511 horn will have far more effect on sound quality then any move from just about ANY competently designed SET, Jeff.
The Mind has No Firewall~ U.S. Army War College.
Altecs 1.4" 288 driver mated to the 511 just kills any of their 802/806/902s with the 811.
Likewise, JBL 2" driver 2446 mated to the outrageously large 2360a is even better. Is there something going on here sizewise?
At the request of the Moderators,
This space has been deleted
Except that the standard 511B is a 2 bolt 1" throat horn while the 288 is a 3 bolt 1.4" exit driver. Not easy to put together.
There is a rare 511E variant with a 3 bolt flange and shorter length but it's not likely to find a pair.
Edits: 10/07/14
No.
I was attempting to draw a corollary for Jeff that any improvement in our amplifiers pales in comparison to speakers... and in turn speakers, Pale in comparison to improvements in the ROOM. Jeff makes claim to the near mystical properties of the 12AX7 {properly implemented with his proprietary flooby dust} direct coupled to a 2A3 as, be all, END all sound. I have heard excellent sound from many circuits. I believe no two people hear exactly the same, furthermore, no two people appreciate the same in sound.
Perhaps, Jeff thinks differently.
The Mind has No Firewall~ U.S. Army War College.
Yes !!! But the effect would NOT be in a positive way.
What the heck are you talking about?? On a A7, "nix to the 511" according to Greg Monfort ( aka "GM" ) and Dennis Fraker, both of who are uber experienced and uber smart, audio geniuses, and who I would implicitly trust.
Jeff Medwin
You must be listening in a 10 by 8 foot room with a 7 ft. ceiling, Jeff.
Basically, Tractrix and/or Constant Directivity ... and the bigger the horn... the better. If one is striving to hold on to bass in the midrange...stay with an exponential. These are basic axiomatic truths.
There are however, many opinions.
The Mind has No Firewall~ U.S. Army War College.
Jeff:
Did you ever get your audio parts cryo'd?
No, been spending my audio time and "mad money" on other items, like these three ( under ten Ohms each ) power supply chokes, and wire implementations.Cryoing WILL get done.
I am building a SE DC stereo two stage 6AH4GT amp for ALTEC A7-800s at this time, photo of work-in-progress is above. This build takes up my resources, both mental and financial.
Jeff
Edits: 10/05/14
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