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I'm currently running EH 300B in my SET and I like them. I'd like to keep a similar sonic balance but more / better (e.g., bass, resolution, etc.). Under $1000 for the pair, what are my options?
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Two power supply chokes that are under 20 Ohms each in DCR. Maybe a pair of the new EDCOR 1.5 HY at 17 Ohms DCR XC-Series inductors. About $30 each, plus, rewire the lead ins and lead outs to heavier, better wire. Use a pair of 50 uF DC-LINK caps, one between them and one after them.
Nothing really good happens till your DHT amp has that type of filter to the finals in it !!
You can pocket the $900 I just saved you, and get really excited about listening to music without wondering to yourself " I wonder what it was like when they recorded this ? ".
Jeff Medwin
The 1.5H choke would be a good replacement for a 50 ohm resistor.
Other than that, where does he stop before it becomes a one stage 12AX7 struggling against an onslaught of miller capacitance from direct coupling to a 2A3 with a hashy power supply upgraded with a bundle of 3 three inch long Kimber Cable(tm) wires (none of which are black) supported by three brass washers and a power cord soldered to the power transformer :-)
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: 10/04/14
"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
~!
The Mind has No Firewall~ U.S. Army War College.
spin in a circle and cluck like a chicken. Everything will be all good.
--------------------------
Buy Chinese. Bury freedom.
.
I like the JJ 300Bs I am running in my JJ 322. They are quite open and explicit sounding...for more money though I would think about KR 300Bs.
"I'm currently running EH 300B in my SET and I like them. I'd like to keep a similar sonic balance but more / better (e.g., bass, resolution, etc.). Under $1000 for the pair, what are my options? "Try the Gold Lion 300B. They are from New Sensor, as are the EH's. Similar voicing, just better in every way!! I think they may be the "sleeper bargain" of 300B's. About $300 a pair. I have Shuagang Black Bottle Treasure Z's and the Gold Lions. Both are great sounding tubes at a similar price.
IMO, the high end European 300B's are just a bit too sterile and solid state sounding. Of course YMMV!!
Cheers,
Geary
Edits: 09/28/14 09/28/14
nt
Observe, before you think. Think before you open your yap. Act on the basis of experience.
The EML XLS is a excellent sounding and exceptionally well made 300b. This and the very expensive Japanese Takatsuki are the best I've owned
both make excellent tubes
The best 300B tubes made at this point of time in my opinion are the KR Audio and EML. They also give the option to go XLS for more power if you can handle the B+. They do cost a bit more than your average 300B tube but they have an outstanding build quality.
My 2 C.......
“If you don't like what you're doing, you can always pick up your needle and move to another groove.” Timothy Leary
Try Sophia carbon 300B's.
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