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Offline debk

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Reply #30 on: January 08, 2013, 12:08:29 PM
Very nice!
Looking forward to building one

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 Demsy

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Reply #31 on: January 08, 2013, 01:59:39 PM
Looks very nice! My only concern is the way the two caps near the pots are fixed to the baseplate, will the double face tape withstand the higher temperature of the baseplate once the amp is running?


Offline earwaxxer

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Reply #32 on: January 08, 2013, 02:04:38 PM
Thats quite a kit! - I bet it sounds fantastic!

Eric
Emotiva XPA-2, Magnepan MMG (mod), Quickie (mod), JRiver, Wyrd4sound uLink, Schiit Gungnir, JPS Digital power cord, MIT power cord, JPS Labs ultraconductor wire throughout, HSU sub. powered by Crown.

Offline Doc B.

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Reply #33 on: January 08, 2013, 02:23:06 PM
Quote from: Demsy on January 08, 2013, 01:59:39 PM
Looks very nice! My only concern is the way the two caps near the pots are fixed to the baseplate, will the double face tape withstand the higher temperature of the baseplate once the amp is running?

We have used these ny-tie holddowns on many kit chassis panels over the past 18 years without a problem.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline corndog71

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Reply #34 on: January 08, 2013, 02:53:59 PM
Whoa!  That looks intense.  And awesome!

The world was made for those not cursed with self-awareness.

Rob

Offline xcortes

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Reply #35 on: January 09, 2013, 01:38:32 AM
Awesome!

Xavier Cortes

Offline Jim R.

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Reply #36 on: January 09, 2013, 04:14:49 AM
Can I ask how tall the amp is?  In other words, how much vertical clearance would a rack eed to have for this?

Thanks,

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 Paul Joppa

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Reply #37 on: January 09, 2013, 04:24:20 AM
Quote from: Jim R. on January 09, 2013, 04:14:49 AM
Can I ask how tall the amp is?  In other words, how much vertical clearance would a rack eed to have for this?

Thanks,

Jim

Same as Paramount, 4" base plus 6" 300B, total about 10". I'd leave another 2" for cooling air flow around the tube, but the tube is run at relatively low dissipation so you could compromise on that a bit.

Paul Joppa

Offline johnsonad

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Reply #38 on: January 09, 2013, 04:30:15 AM
Quote from: Jim R. on January 09, 2013, 04:14:49 AM
Can I ask how tall the amp is?  In other words, how much vertical clearance would a rack eed to have for this?

Thanks,

Jim


Come on Jim, you know you want one! :)

Aaron Johnson

Offline Jim R.

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Reply #39 on: January 09, 2013, 05:17:37 AM
Paul -- thanks -- 10" is the max shelf clearance on my rack, so I'd have to check out if my TT could go in that space and the pre on top.  Still pondering...

Hey Aaron, you're right! :-)

I've got to take some time to heal first then I can regroup and plan the next steps.  Looks like Dowdys will be coming next week.

-- 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 xcortes

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Reply #40 on: January 09, 2013, 05:51:35 AM
It looks like one could enlarge the transformer holes to add an extra set of those nice Neutrik rca jacks.

Have the caps values been defined? What are types the stock ones?

Xavier Cortes

Offline Paul Birkeland

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Reply #41 on: January 09, 2013, 07:06:29 AM
Quote from: xcortes on January 09, 2013, 05:51:35 AM
It looks like one could enlarge the transformer holes to add an extra set of those nice Neutrik rca jacks.

Have the caps values been defined? What are types the stock ones?

Hmm, I suppose you could enlarge those holes if you wanted.  Getting everything perfectly aligned by hand drilling can be frustrating.  Standard insulated gold RCA jacks should fit in those holes. 

The caps are 10uF/250V stock.  Two will dominate the sonics of the single ended outputs, and all four the balanced output.  200V is a sufficiently high voltage rating for these caps.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Doc B.

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Reply #42 on: January 09, 2013, 07:33:01 AM
By the way that cap value was arrived at empirically by measuring bass response with cap values ranging over about 1uF to 20uF. Anything below 10uF was where we saw some bass roll off into lower impedance loads.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline xcortes

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Reply #43 on: January 09, 2013, 07:53:14 AM
A pair of Auricaps at Percy will cost 65.

Xavier Cortes

Offline Doc B.

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Reply #44 on: January 09, 2013, 08:44:31 AM
I plan to try some Audiocap film and foil caps next week. Right now I am experimenting with rearranging the positions of the drivers in my speakers after a listening session on Friday. Some new, slightly lower seating seemed to make the image kind of high in the room. I have to redo time alignment and trim levels, then we will do some comparison of the stock metallized caps vs. Audiocaps.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

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