SR45 amplifier

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Offline Paul Birkeland

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Reply #105 on: December 05, 2012, 01:03:27 PM
Quote from: johnsonad on December 05, 2012, 10:57:29 AM
Would it be too much extra to design two different PS boards, one for film (with a choke or two) and a standard CRC supply to cover both bases? 

Two power supply boards for an amp that isn't likely to be a big seller is unlikely.  On the other hand, I think Doc, PJ, and I are all desiring to get as many of the electrolytics out as possible. 

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline xcortes

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Reply #106 on: December 05, 2012, 02:07:24 PM
1

Xavier Cortes

Offline johnsonad

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Reply #107 on: December 05, 2012, 03:11:05 PM
Quote from: Caucasian Blackplate on December 05, 2012, 01:03:27 PM
On the other hand, I think Doc, PJ, and I are all desiring to get as many of the electrolytics out as possible. 

-PB

 ;D

Aaron Johnson

Offline Paul Birkeland

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Reply #108 on: December 05, 2012, 03:56:23 PM
We also have some other experiments to do that could set this apart from the original SR-45.  That circuit is quite exceptional as-is, but we have to do our due diligence before release to ensure that we haven't "missed" any opportunities. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline xcortes

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Reply #109 on: December 05, 2012, 04:36:16 PM
You can experiment all you want as long as your end design works with my 404s. :)

Xavier Cortes

Offline Paul Joppa

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Reply #110 on: December 05, 2012, 05:31:38 PM
Not to worry, Xavier, I have already analyzed a different set of resistors to best match a 5K load.  :^)

Paul Joppa

Offline johnsonad

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Reply #111 on: December 06, 2012, 02:17:12 AM
Quote from: Paul Joppa on December 05, 2012, 05:31:38 PM
Not to worry, Xavier, I have already analyzed a different set of resistors to best match a 5K load.  :^)


 :) :) :)

Aaron Johnson

Offline xcortes

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Reply #112 on: December 06, 2012, 02:27:58 AM
Thanks

Xavier Cortes

Offline johnsonad

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Reply #113 on: December 06, 2012, 06:00:16 PM
PJ, if you could factor in an available 2.5v/4% tolerance/1.5 amps supply for the heaters so that we can safely use EML tubes, I would appreciate it!  ;D

Aaron Johnson

Offline braubeat

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Reply #114 on: December 07, 2012, 04:39:55 AM
Would the Magnequest sex amp upgrade iron be suitable for this project?

Michael


Offline tsingle999

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Reply #115 on: December 07, 2012, 03:57:09 PM
I use the sex mq plate chokes with tfa 2004 jr outputs (currently m4/co slice). I cant recommend the current amp enough. I just put in a pair of cobalt grid chokes and im listening to it after and the bass is slamming. I am trying to think if i turned up the sub levels. So yesterday n all day im just amazed at the bass. Im thinking the sub is really sounding great. So 2 days later i noticed i had disconnected the sub from the amps when i worked on them and not reconnected them. Amazing bass now! And i always thought it was amazing bass...

SGS iTransporter with Qobuz & Roon to Optical Rendu to BH DAC (Battery) / Wavelegth Cosecant to BeePre to 300b(ehemoths) to Jagers.
Bottlehead Stat headphone amp with Wavelength Brick DAC

Offline Paul Joppa

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Reply #116 on: December 07, 2012, 06:20:57 PM
Quote from: johnsonad on December 06, 2012, 06:00:16 PM
PJ, if you could factor in an available 2.5v/4% tolerance/1.5 amps supply for the heaters so that we can safely use EML tubes, I would appreciate it!  ;D
2.5v at 1.5A IS the 45 tube spec, so it will certainly handle that ...

Paul Joppa

Offline Jim R.

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Reply #117 on: December 08, 2012, 06:17:06 AM
Terran,

Amazing bass?  How sweet the sound?  Sorry, couldn't help myself.

BTW, are those the Orcas you're talking about?

That would be the second time I've heard about people marvelling at the bass and then realizing they didn't have the subs connected/turned on.

-- Jim

Jim Rebman -- recovering audiophile

Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).

s.e.x. 2.1 under construction.  Want list: Stereomour II

All ICs homemade (speaker and power next)

Offline tsingle999

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Reply #118 on: December 08, 2012, 06:49:34 AM
Lol nice lyrics!  it was actually the Abbys. Can't afford the orca subs yet. I have been ok with the abbys always wanting a bit more but this mod has transformed the speaker. The orcas are on my desk at work with my pdg and doing very well...

SGS iTransporter with Qobuz & Roon to Optical Rendu to BH DAC (Battery) / Wavelegth Cosecant to BeePre to 300b(ehemoths) to Jagers.
Bottlehead Stat headphone amp with Wavelength Brick DAC

Offline johnsonad

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Reply #119 on: December 08, 2012, 01:51:05 PM
So Clark says you two (PJ, PB) got a chance to listen to his new Feastrex cab design  ;D

I'm now in for two pair, one for headphone use and the other to drive this upcoming speaker. 

Aaron Johnson

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