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Old 25th September 2010, 11:12 AM   #21
M Gregg is offline M Gregg  United Kingdom
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Soro,

Nice project!

Dovla,
Interesting link. I used this because I wanted to run the ECC82 from 12V DC. To see what happened!

Bigun,

" Photo's of the inside"

It was done in a few hours so it's a bit of a birds nest!

Because it was in a wooden box I had to screen cables. I used PTFE silver plated cable as a twisted pair covered in foil with a drain wire twisted around the foil, covered with heat shrink!

Regards
M. Gregg
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Old 25th September 2010, 02:34 PM   #22
soro is offline soro  Taiwan
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Thanks M Gregg

I use bettery supply B+ 12V
and sound is sweet.
now the tube is made for car use.
tube type is 6DJ8 .
my friend say the tube is use to fix BMW car stereo.
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Old 25th September 2010, 02:52 PM   #23
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Have you considered abusing an op-amp or emitter follower
as a unity gain buffer to drive the grid in continuous A2?

Bootstrap plate load to increase both voltage and impedance.

Seriously look into capacitive charge pump doubler or tripler.
Also investigate boost switcher ICs for driving a string of LEDs.
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Old 25th September 2010, 03:30 PM   #24
Bigun is offline Bigun  Canada
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Quote:
Originally Posted by M Gregg View Post
Bigun,
Because it was in a wooden box I had to screen cables. I used PTFE silver plated cable as a twisted pair covered in foil with a drain wire twisted around the foil, covered with heat shrink!
M. Gregg
It looks pretty dapper to me, nicely done !

p.s. my amp is also a bit of a birds nest, I'm the process of trying to tidy it up but I'm not sure its worth the trouble.
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Old 25th September 2010, 03:56 PM   #25
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Hello,
Here is a suggestion. The 12AU7 is a fun tube to play with. To reduce the cost of my fun I bought a several 9AU7’s. They work well heated by surplus wall warts.
DT
All just for Fun!
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Old 25th September 2010, 04:02 PM   #26
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by kenpeter View Post
Have you considered abusing an op-amp or emitter follower
as a unity gain buffer to drive the grid in continuous A2?

Bootstrap plate load to increase both voltage and impedance.

Seriously look into capacitive charge pump doubler or tripler.
Also investigate boost switcher ICs for driving a string of LEDs.
Post a few circuits! LOL

A bit off topic:

I am building an Aikido pre using recom DC to DC for the heaters and inverter for the HT 450V with 350 V 60mA regulation at the moment. Also EM81 Vu meters. Run from 12V power supply. I will post this in another thread when complete!

Its an on going project!

Regards
M. Gregg

Last edited by M Gregg; 25th September 2010 at 04:05 PM.
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Old 25th September 2010, 04:40 PM   #27
soro is offline soro  Taiwan
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my circuit also can use 12AU7. 6922
12AX7 need change some resistance.
so it can have many choose.
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Old 25th September 2010, 07:12 PM   #28
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Quote:
Originally Posted by M Gregg View Post
Post a few circuits! LOL
Tube can work in low volt~~fix your knowledge
See Post#94 of that thread...

Last edited by kenpeter; 25th September 2010 at 07:15 PM.
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Old 25th September 2010, 07:26 PM   #29
vince76 is offline vince76  Italy
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you can try this:
www.audiofaidate.org • Leggi argomento - PREcario (C) pre linea a batteria

he says:At 700mVrms distorsion is very low, close to the limit of measuring setup (0,03%)

V
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Old 25th September 2010, 08:00 PM   #30
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If you don't mind building a power supply, get a 12VAC transformer, stack a six stage voltage doubler on it, smooth it with a couple pi filters, and run your tube off that. This will get you a quiet, high enough voltage to make a high quality amp. Use a lm7812 for both your heater and the output stage. I did a lot with the lm386 in my beginnings, and honestly think their gain is too high to use a tube in front of them for hi-fi. I'd just build a Szekeres mosfet follower, and drive that with the tube, that's my favorite low-watt hybrid amplifier setup.
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