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Old 21st September 2012, 11:27 AM   #11
Birder is offline Birder  United States
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I am using EH 6922's for the pre, and a Ruby 6L6 J/J 12at7 for the psu. All of my tubes were only around a hundred bucks. I didn't want to invest too much yet, just in case....
Mine is mounted on a plywood board just like yours too. It looks like your tranny feeding the 12 at7 is left ac? On mine a made a simple 12 volt 7812 regulator to feed it dc. This might help. Also try to move the transformer further away. I am using iron core hammond 300 series. I grounded the psu to mains, and grounded my volume pot. This helped a lot with " noise".
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Old 22nd September 2012, 08:17 AM   #12
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Or, You just probably got a high gain brand input tube that is sensitive enough to sense the position of your hand like theremin effect..changing the tube could solve the problem and there's no need for the input to be shielded as I have suggested.
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Old 22nd September 2012, 10:05 AM   #13
DF96 is offline DF96  England
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Could be VHF oscillation. Are grid stoppers right on the pins, not half an inch away? Remember, the 6DJ8 was designed for high performance VHF receiver duty and it doesn't know you only want it to amplify up to 20kHz. Layout could be critical with this sort of valve, as any circuit loop could look like a resonator.
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Old 18th December 2012, 08:11 AM   #14
terfyo is offline terfyo  Singapore
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Hi all,

Do you guys have the schematic diagram for the line stage?

I would like to build one using point soldering instead of buying the PCB itself.

Please help!
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Old 22nd December 2012, 02:53 PM   #15
gk7 is offline gk7
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Old 9th July 2013, 10:27 AM   #16
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I also am doing this clone, I'd like to know that transformers are using in your project. I am still involved with the pcb components.
It's my first diy project.
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Old 1st September 2013, 04:55 AM   #17
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Sorry, I have not followed my own thread for some time...

My SP10 is perfectly working now. I had oscillation from the E88CC (6DJ8) tubes. I added grid stoppers to the first pair of tube near the input.

A tube guru I know told me that the tubes were oscillating and that 1K grid stoppers directly soldered on the sockets would be needed. Took his advise and did some more research on the issue as I wanted to understand but now it is a thing from the past. This preamp of really superb!

Also, the volume pot is better located at the output than the input according to my tests. This way it is totally silent.

Hi hobbit1979, I'm using several transformers, one Antek AS-1T200 for B+, also a 12.6Vac for filament of PSU and another transfo for SP10 filament.

Have fun with the project!
PREAMPs : Bal AMB α10 + JC-80 | Bal DCB1 | Bal LDR3x | AMPs: AMB β24 | ExtremA | FO v1.4 | USSA5 | TSSA | Telos 390 Clone | NX Amp | FC-100
DACs : TPA Buffalo II + OPC's NTD1 I/V | JLsounds | Mirand AK4490 + Discrete Output Speakers : Troels Gravesen ATS-4 | Sagwee LT V3
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Old 2nd September 2013, 09:04 AM   #18
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Thanks for answering, I will consider your advice.
I'm going to use a transformer windings canterbury these specifications (hopefully worth because I have made ​​to order):

Power rating: 147VA
Primary: 0-230V @ 50Hz
Secondaries: 195-0-195V @ 70mA rms + 2 x 0-15V@2.5A rms + 0-12.6V @ 2.5A rms + 0-63V @ 2A rms

A greeting.
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Old 1st April 2014, 01:36 PM   #19
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I have ridden this power supply but I have these output voltages:

J6 and J7: 4.5 V instead of 12.6V
J8: 330V instead of 305V VR1 not adjust voltage

Attached Bom and photo psu.
Attached Images
File Type: jpg Bom.jpg (505.8 KB, 311 views)
File Type: jpg psu.jpg (761.7 KB, 300 views)
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Old 2nd April 2014, 10:36 AM   #20
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More photos psu.
Attached Images
File Type: jpg P1000740.JPG (568.8 KB, 277 views)
File Type: jpg P1000744.JPG (771.2 KB, 265 views)
File Type: jpg P1000752.JPG (711.5 KB, 256 views)
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