SR45 amplifier

debk · 181420

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Offline xcortes

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Reply #135 on: December 20, 2012, 11:11:21 AM
Jim,

The obbligato's praised by Grainger come in such high values and are not expensive. Those will be my in mine I think. For the coupling caps I'll use vcaps.

Do you think it would make sense to group and buy together the basic components. That is, the psu and ps ones. Anyone else?

Xavier Cortes


Offline Paul Joppa

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Reply #136 on: December 20, 2012, 11:26:42 AM
The BH-5 replaced the TFA-2004Jr as tha Paramour upgrade. The accompanying BH-6 choke (40H/50mA) can be used, or you can ask for a BH-2 which is the same thing but gapped for 50H/40mA.

The original circuit was optimized for 3K impedance. The one I am currently working on is optimized for 4K. Performance is fairly insensitive to impedance - if I had to chose a range I'd say 2/3 to 3/2 of the design target is OK.

Paul Joppa


Offline Jim R.

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Reply #137 on: December 20, 2012, 12:14:10 PM
Howie, I think there was at least one person who built his sr-45 with the eo-45, and there was probably some discussion on this in another thread.  You would get a slightly higher damping factor with the exo-45, but how significant that would be in audible terms I have no idea.

Xavier, I already have everything as I found a bunch of mundorf m-tube caps when going through all my piles of stuff, and I may even use a couple of the 30 uF ones for the PF cap.  Thanks for the reminder of the obligato -- I'll have to go have a look at those too.  And I also found the Continental caps come in a 30uF 630 v size that isn't too huge and not horribly expensive, and gets some nice comments (it is of similar type to the v-cap OIMP -- oil filled polyester), so those may be worth checking out.  I also already have the .1 uF copper/teflon v-caps.  I think there is a reality MR series in this value too, but it may be just too huge, and the price tag is more than I'd want to spend.  The larger value v-cap OIMPs don't have sufficient voltage ratings and of course they are way pricey too.

Paul, unless you know otherwise, Mike does not seem willing to sell BH upgrade iron a la carte -- everytime I've asked, it's the whole package or nothing at all.

-- 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 johnsonad

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Reply #138 on: December 20, 2012, 03:55:16 PM
Xavier,

Are you talking about the old version or upcomming version?  If the later, I'm in for a group buy.   I imagine we could save some on PS caps, relays and such. You are building three pair correct? I'm in for two pair.


Aaron
« Last Edit: December 20, 2012, 03:58:46 PM by johnsonad »

Aaron Johnson


Offline xcortes

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Reply #139 on: December 20, 2012, 05:18:17 PM
I was talking about the old one but I'll do three pairs of the new one so ... unleash hell.

Xavier Cortes


Offline Paul Joppa

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Reply #140 on: December 20, 2012, 05:24:27 PM
Well, if Mike won't break up the set you will have to wait until he does another run of TFA-2004Jrs.

Paul Joppa


Offline xcortes

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Reply #141 on: December 20, 2012, 05:37:04 PM
Or buy the set an give the chokes another use.

Xavier Cortes


Offline xcortes

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Reply #142 on: February 07, 2013, 03:42:39 AM
The pair of Jr Co that the seller was asking 4k for are now an auction starting at 399. Just a heads up!

Xavier Cortes


Offline johnsonad

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Reply #143 on: February 07, 2013, 05:05:07 AM
Thanks Xavier.

Things should start to move forward now that the BeePre is on street  :) :) :)

Aaron Johnson


Offline Jim R.

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Reply #144 on: February 07, 2013, 08:19:26 AM
Thanks Xavier, but I now have my plan in place and I certainly don't have the momey to get into an auction at this point as nice as the Co Jrs would be.

Today there will be a box arriving from a a guy in Philly with a couple of massive plate chokes in it, with more boxes to follow soon.  This box will have a fresh pair of Dowdy chokes gapped for 60 mA in it, and which may just find their way into my planned Paramount 2a3 build.

Tomorrow another box from BH will be arriving -- this one with the last of the FP IIs, but with a few twists :-).

Plan to be up with the SR-45s driving the Nagas and subs this weekend.

-- 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 RPMac

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Reply #145 on: February 07, 2013, 09:06:25 AM
The pair of Jr Co that the seller was asking 4k for are now an auction starting at 399. Just a heads up!
Nobody is bidding on those...I'm not. ::)



Offline debk

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Reply #146 on: February 13, 2013, 09:39:58 AM
Did anyone here win the auction for the TFA-2004jr cobalt pinstripe on ebay.
I bid but was not fast enough at the end to win

Debra

Debra K

Eros 2Phono amp
BeePre2, Psvane ACME 300b
Kaiju, Linlai Elite  300b
Monamour 2a3 amps various tubes
Sota Sapphire, Pete Riggle Woody Tonearm, Kiseki Purpleheart Cartridge
Rega P6 Ania Pro cartridge
Roon Nucleus
MHDT Labs Orchid DAC
Jager speakers


Offline xcortes

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Reply #147 on: February 13, 2013, 09:59:31 AM
How much did they go for?

My pair arrived today!

Xavier Cortes


Offline debk

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Reply #148 on: February 13, 2013, 10:19:10 AM
They went for $733.  I fI had won them I was going to use them in a SR45


Deb

Debra K

Eros 2Phono amp
BeePre2, Psvane ACME 300b
Kaiju, Linlai Elite  300b
Monamour 2a3 amps various tubes
Sota Sapphire, Pete Riggle Woody Tonearm, Kiseki Purpleheart Cartridge
Rega P6 Ania Pro cartridge
Roon Nucleus
MHDT Labs Orchid DAC
Jager speakers


Offline xcortes

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Reply #149 on: February 14, 2013, 12:01:46 PM
Today is a great day!

My brother delivered from the US my new pair of 2004Jrs with Co pinstripes for a pair of "Mk I" SR45s to be used with the WEs. He also delivered the third pair of TL404s to build an equal number of SR45 "MK II" amps for the main system when the new design around PT-7s (maybe a new kit?) comes out.


Xavier Cortes