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Old 13th November 2009, 12:32 AM   #101
88man is offline 88man  United States
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Sorry, about that here is the pix...

Previous entry deleted: Thank you Alexg, Curly, and mhouston! I thought, I could get by with the larger tubes in a nice straight line. I guess not. Here is another sketch, I placed the rectifier near the power supply corridor. I'll center the KT88s in front of the OPT, but space them about 2.5in apart. Is this better?...

BTW, what is the power output of this amp with B+ @ 410-420V?...
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Old 13th November 2009, 06:34 AM   #102
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Quote:
Originally Posted by Curly Woods View Post
Oops. You forgot the sketch On another note, I meant to say 2.5" between the envelopes pf the tubes, which is a little closer to 4" between the sockets, as Alex stated in his post. Sorry for the confusion!
Wouldn't get to tied down to feet and inches. Make a resonable layout and build it.
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Old 20th December 2009, 05:55 PM   #103
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Default also uper 5mA is better 6N1P-EB than 6922/E88CC

Quote:
Originally Posted by Sherman View Post
I also tried a 6DJ8 and a Sylvania 6922. Both seemed to make the amp produce less bass. Overall the sound, even in the midrange didn't seem as good as with a 6N1P.

I don't have any experience with the 5670 but the current limit on a 6N1P is 25mA. Seems more than enough. I'm only running mine at about 8 or 9 mA.
Dear Sherman
Wiht 4-5 mA I believe that is better the 6992, 6n23p,e88cc etc.

You have in the 6n1p 8ma
more adapted to obtain the better sound from 6n1p,
better than family 6922,
(in my "Bjou" headamp up 6n1p-eb than Telefunken goldpin diamond base 6922/E88CC)
have CCS, or the change to other C-R-C (15K-C-33k to anode),
it is thus sufficient to obtain a current of 8mA?

Thanks and greetings
Fernan

Escuses by my babelfish inglish translator.
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Old 21st December 2009, 02:50 AM   #104
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Talking High voltage PSU filtering

Quote:
Originally Posted by porkchop61 View Post
Has anyone ever used a cap-resistor-cap for power supply decoupling in the power supply of this amp?
I typically do this for all my guitar amplifiers. I usually use (2) 50uF 450V electrolytics, and a 10k 1 watt in between the caps.
If anyone has done this, what did you use for the resistor and capacitor values?
Thanks in advance.
Glenn
The best possible circuit for high voltage power supply filtering (if no semi-conductors are used or desired) is in this order: Tube Rectifier - Choke - Cap - Choke - Cap. The reason for this is the first choke actually will regulate the voltage significantly without a cap before it while the next best filtering method would follow by the Cap - Choke - Cap.
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Old 21st December 2009, 10:11 AM   #105
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Quote:
Originally Posted by Sherman View Post
IIRC I used about a 15K resistor and a 22uF cap. I then adjusted the plate resistor on the 6N1P to around 33K.
Yes, I talked about to this R-C (15K-22uF) and R (33K) towards 6n1p, an this mod, obtain 8-9mA.
Thanks
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Old 22nd December 2009, 11:08 AM   #106
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Pardon by repeat
dopkomachine I thought that it responded to me:

Thanks
Fernan
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Old 12th January 2010, 08:41 PM   #107
cryo is offline cryo  United States
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Default KT--8 build

Someone asked if there were any other builders besides Sherman. This is my iteration. Sherman actually helped me a lot on this.

It is very nice sounding, won't drive anything big, but that's not my need.

Good luck with yours!

-cryo
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Old 13th January 2010, 01:25 AM   #108
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Quote:
Originally Posted by cryo View Post
Someone asked if there were any other builders besides Sherman. This is my iteration. Sherman actually helped me a lot on this.

It is very nice sounding, won't drive anything big, but that's not my need.

Good luck with yours!

-cryo
I really like the look of that amp cryo, there's a touch of class to it. The layout is well balanced (to my eyes, anyhow) and the sloped wooden sides are quite interesting. Did you machine the top panel yourself?

Any chance of a look at the underside?
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Old 13th January 2010, 02:02 AM   #109
tim614 is offline tim614  United States
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Quote:
Originally Posted by cryo View Post
Someone asked if there were any other builders besides Sherman. This is my iteration. Sherman actually helped me a lot on this.

It is very nice sounding, won't drive anything big, but that's not my need.

Good luck with yours!

-cryo

Nice work! even like the pic, the granite's colores just add a nice look to it.
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Old 13th January 2010, 03:42 AM   #110
cryo is offline cryo  United States
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Thanks for the remarks. Yes, I machined the top myself. After driving myself crazy laying things out on aluminum plate, I got smart and lazy. Made CAD drawings exactly to scale of what I wanted and printed out on plain paper. Then I glued that to the plate and drilled/milled exactly to what was on the print-out. Much easier.

I have a pic of the underside somewhere. I will post it in a few days when I find it, or pop it up and take a new one.
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