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#26 pre amp
#26 pre amp
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Old 4th June 2011, 02:55 PM   #1041
massimo is offline massimo  Italy
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You're welcome.
Those resistors look good, but might not be enough: trim the value after power up xfrm and filament (just those two) and check V AC at cathodes. Keep a couple of 0.1-0.22/2W handy.

P.S. Sole means Sun..... Friend is Amico. We don't say Sun to a friend
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Old 4th June 2011, 03:17 PM   #1042
merlin el mago is offline merlin el mago
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Thanks again your sun has illuminated me, still I'am waiting your congratulations to win F.C. Barça the Football Champions League...
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Old 6th June 2011, 03:42 PM   #1043
merlin el mago is offline merlin el mago
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I found this interesting 4 pole 22 position Alps Switch for $26.95, what values to do a 100K ladder because I don't trust in the included Java calculator?

4 Pole 22 Position Alps Switch

http://http://www.quadesl.com/attenuator.html
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Old 12th June 2011, 06:12 PM   #1044
FRUGIVO is offline FRUGIVO  Spain
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Hi all
I finished reading through this interesting thread
I was hooked from beginning to end
I am prepared to enter the community of # 26
I'm gathering all the pieces to mount the preamp # 26

thanks to all

saludos---------------Pedro
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Old 25th June 2011, 03:14 PM   #1045
merlin el mago is offline merlin el mago
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Advice for chassis / box for 26 pre amp without PSU, thanks in advance for suggestions.
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Old 25th June 2011, 04:16 PM   #1046
massimo is offline massimo  Italy
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I'm gonna use two HiFi2000 Galaxy Maggiorato, one for the #26s, one for PS. Dimensions: 23 (W) x 8 (H) x 28 (D) cm
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Old 25th June 2011, 04:59 PM   #1047
andyjevans is offline andyjevans  United Kingdom
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I use the modular alu extrusions from Penn Fabrication.

Penn Elcom : MSB - Frame Extrusions

I use the 2U versions - they come in different widths. Then I put two wooden pieces on each side and screw them into the holes on the extrusions. I make everything like this, except when I use Rittal Rackmount subrack parts, which are similar but have better facilities.

Horizontal rail
42 HP RP 3684.560
84 HP RP 3684.562
Threaded insert, M2.5
42 HP RP 3684.608
84 HP RP 9901.816

Rittal RP 9901.816 Threaded insert M 2.5 84 HP (5X2)

I use a pair of horizontal rails for the front panel, top and bottom, with a piece of nice metal in between, and screw the top plates and bottom plate in with M2.5 screws which go into the threaded insert. That way I can use any combination of top plates. My top plates are 275mm front to back, which I find is excellent.

Love playing with this stuff - it's like building meccano.

andy
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Old 25th June 2011, 05:22 PM   #1048
andyjevans is offline andyjevans  United Kingdom
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Here are some photos of my 26 preamp in 3 boxes - PSU is AZ1 mesh, the filament supply for filament bias has two large chokes, and you can see the large 10 ohm resistors (4 in series parallel per side) on top of the preamp!
Attached Images
File Type: jpg 26Pre_best.JPG (238.0 KB, 612 views)
File Type: jpg 26Pre_side1.JPG (201.7 KB, 559 views)
File Type: jpg 26Pre_under.JPG (232.2 KB, 555 views)
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Old 25th June 2011, 05:24 PM   #1049
andyjevans is offline andyjevans  United Kingdom
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And here's the whole setup, together with a Dac-Pre which illustrates modular construction.
Attached Images
File Type: jpg 26Pre_all1.JPG (246.2 KB, 552 views)
File Type: jpg 10Y DacPre.JPG (223.1 KB, 535 views)
File Type: jpg 10Y DacPre-1.JPG (210.8 KB, 295 views)
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Old 25th June 2011, 07:46 PM   #1050
merlin el mago is offline merlin el mago
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@andyjevans
Nice work congratulations, modular looks remember Cello stuff.

@massimo
Thanks to remember me I forgot moudshop I bought other chassis, surely I will buy a couple like you due to the fact that I hate drill surely I will buy drilled both chassis PSU & pre-amp.
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