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Test # 1........

99.5.232.186
Posted on June 29, 2015 at 21:54:04
drummerwill
Audiophile

Posts: 965
Location: St Louis Mo.
Joined: January 7, 2003
















I just wired up my Type 26 Filament supplies for the Version #2 of my 26-26 DC 45 amp. All seems to work well. This time instead of building a LM338 Adjustable power supply to drop the voltage from 5.0 to 1.5 DCv....
I used a 3Amp Adj. DC to DC converter , we'll see if it's as quite as the DIY converter with the LM 338.
I was really happy with the noise level of the Version #1 amp.

Onward !!

Willie

 

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RE: Test # 1........, posted on June 30, 2015 at 03:58:59
vinnie2
Audiophile

Posts: 4481
Location: North Carolina
Joined: September 28, 2013
 Willie
Your email address is not working. That is why you haven't got an answer from me. I tried posting on tube diy but you must not have seen it. Correct your email on the asylum and send me an another email and we can continue our discussion.
Cool amp by the way!
Vinnie

 

Gotta' "love"......, posted on June 30, 2015 at 06:39:28
drlowmu
Manufacturer

Posts: 9730
Location: East of Kansas City
Joined: January 10, 2005
 The short distance between the input RCA jack, and the grid of the first Type 26 tube. Hooray for Willie !!! Excellent.

But if those are 120 VAC AC switches on the front, they best be placed in the rear of the chassis near the power transformer, far away from input tubes, field wise.

Jeff Medwin

 

RE: Test # 1........sorry vinnie !, posted on June 30, 2015 at 14:20:20
drummerwill
Audiophile

Posts: 965
Location: St Louis Mo.
Joined: January 7, 2003

I'm trying to figure how to correct my email !

Soon!

Willie

 

RE: Test # 1........, posted on June 30, 2015 at 15:04:02
drlowmu
Manufacturer

Posts: 9730
Location: East of Kansas City
Joined: January 10, 2005
 Willie,

You can email Vinnie through AA and GIVE him your email address. He accepts emails from AA members from what I can tell.

Click on his name, one post above to access message option, OR, try URL I have included.

I have NOT had time to measure my bunch, will do AND get back to you. Amp development process I am in presently precedes everything.

Jeff

 

RE: Test # 1........sorry vinnie !, posted on July 1, 2015 at 03:59:17
vinnie2
Audiophile

Posts: 4481
Location: North Carolina
Joined: September 28, 2013
 Willie
Just click on your name by "posted by" on one of your posts and it will take you right to where you need to be to fix it.

 

RE: Test # 1........, posted on July 1, 2015 at 13:12:49
Triode_Kingdom
Audiophile

Posts: 10038
Location: Central Texas
Joined: September 24, 2006
 Do you know the internal switching frequency of the DC-DC converter? Have you examined its output with a scope to quantify leakage? This could be a big concern, especially if the output isn't completely clean.

 

RE: Test # 1........, posted on July 1, 2015 at 18:32:48
drummerwill
Audiophile

Posts: 965
Location: St Louis Mo.
Joined: January 7, 2003

I guess I'll find out soon !

Thanks TK

Willie

 

RE: Test # 1........ driver stage distortion?, posted on July 2, 2015 at 10:03:49
deathtube 667
 DRW,

Did you figure how much distortion the 26 driver stage puts out when the amp is at a certain power level?

Do you get enough jump factor from the low mu driver tubes in your system?

It seems odd that you would deviate from the 2-stage SE with high mu driver tubes that DF and JM use.

DT 667

 

RE: Test # 1........ driver stage distortion?, posted on July 3, 2015 at 10:28:58
drlowmu
Manufacturer

Posts: 9730
Location: East of Kansas City
Joined: January 10, 2005



I am going to answer your Qs, and Willie may wanna chime in :


"Did you figure how much distortion the 26 driver stage puts out when the amp is at a certain power level?"

Probably not. Is that really important to document, when designing by ear???

Willie operates at UNDER 1 Watt over 90 percent of the time, uses wire-optimized GPA 604s in a MLTL. Aren't better early triodes, like a Type 26, basically linear devices?

"Do you get enough jump factor from the low mu driver tubes in your system?"

Probably. Its hard to compare if you never have fully optimized a single mu of 100 tube really well. ( We work on this, into 2015.)

However, the MAIN POINT of this amp of Willie's is to have an "ALL DHT device" amplifier. Willie LIKES the sound of a DHT front end, and in this case, he is willing to add a stage to get it. Dealer's choice !!

"It seems odd that you would deviate from the 2-stage SE with high mu driver tubes that DF and JM use."

Not too odd. 26s sound nice. It has a theoretical mu of 9, so using two would multiply as 9 times 9, or 81, compared to a single high mu tube with a mu-rating of about 70 ( 6SL7 ) to 100 ( 12AX7, 7B4 ).

Again, Willie's choice, his "trade off" IMHO is (a) adding a cap couple and (b) a third stage to the amp. These two trade offs will lose transparency compared to a VERY well executed two stage amp directly coupled.

Willie may wanna add his two cents !!

Jeff Medwin

 

RE: Test # 1........ driver stage distortion?, posted on July 3, 2015 at 22:48:16
drummerwill
Audiophile

Posts: 965
Location: St Louis Mo.
Joined: January 7, 2003

I already have a couple of Hi mu input 2 stage DC DHT amps, so I know what Hi mu inputs sound like..

This amp is different and sounds as such. How much distortion ..... I don't care it sounds good to me.!!

Have fun

Willie

 

Nicely said Willie., posted on July 4, 2015 at 18:40:18
91derlust
Audiophile

Posts: 1101
Joined: December 25, 2014
 I am really interested in your experiences - especially the significant sonic differences between amp types. So this does not wander further off-track, would you mind if I PM you in the next day or so to discuss? I may even have your email here somewhere...

Regards,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein

 

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