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Old 16th November 2008, 02:12 PM   #591
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Very nice Dr. EM.

You can use a paint marker for a much better acid resist. I use the toner transfer and touch up with a paint marker. I found the Sharpie didn't stand up to the home brew acid/peroxide mix at all.
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Old 16th November 2008, 07:07 PM   #592
fotios is offline fotios  Greece
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Nice implementation Dr. EM. It is obvious your excellent craftsmanship. Bravo!
I have only few comments for the pasive parts that you are using. All resistors are metal film except the 5W emitter which are vertical wirewound. If you have the economic posibility, the next time try to find Metal Plate Cemented resistors (MPC), there is a online store in Germany which is distributor of Futaba resistors, in packs of 50. The price is fairly good. I don't remember the name, type in your browser Futaba MPC resistors to find it. Futaba also offers a big variety of metal oxide film resistors up to 10W and many other difficult to find types.
As for the caps... you have made a cocktail from first quality types, such the Cornell-Doubilier silver mica, the LCR polystyrene foil and the WIMA polypropylene foil with the lower quality Arcotronics polyester which are the white caps. I know, that they was in your stock probably, and Farnell does not have WIMA MKP in 100V range. The same RS components. Try a search in "Selectronic-France" and in "ELFA-Sweeden". These two on line stores they offer a big variety of caps for audio use in good prices and in small quantity if you wish. Evox-Rifa (Sweeden) are good alternatives for WIMA. Also Arcotronics (Italy) polypropylene type are grey colour.
Please, don't misinterpret my comments as criticism. I reffered all above only for information about these stores for any member from Europe who is interested. Me also, i have two amplifiers in use with resistors and caps of middle quality and origin which i don't know

Regs
Fotios
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Old 17th November 2008, 11:57 AM   #593
Dr_EM is online now Dr_EM  United Kingdom
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Thanks for your comments!

I wish there was some logical selection process for my capacitors but it really was what I had and could get easily! Partly I found that the pitch on the board was too narrow for the mica caps I could get so this put me off trying to cram them in there. The poly's don't fit well either but are a bit more comfortable. I already had the arcotronics yeah, bought 100 a while back for filters and things, they are only 63v but I think it's ok for my application, definately on the +/-30v powered amp.

I have done suprisingly little critical listening to these amps yet but if after a while I decide there are some minor flaws I will probably give a go to changing some parts
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Old 17th November 2008, 02:01 PM   #594
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Exclamation Project A

This is my 'Project A' amplifier. Single channel, Class A 20W, FETs.

Do you need more information? Please visit
http://madoptic.narod.ru/projects/a.htm

and..., just , 'google it' ( http://translate.google.com/translat...-8&sl=ru&tl=en )

I'm sorry. It is funny to read it English but I have no time to present a 'pure' English pages at the moment.
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Old 17th November 2008, 02:03 PM   #595
fotios is offline fotios  Greece
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Default Futaba MPC resistors supplier....

Here is the link of a German online store which offer MPC resistors
http://www.buerklin.com/default.asp?l=e
You must type in the "search" box the code: "E074.400" and click on the search button so that the page with the Futaba MPC resistors online catalog will open.

Fotios
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Old 17th November 2008, 09:38 PM   #597
luka is offline luka  Slovenia
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I'm ganna say only O.o
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Old 17th November 2008, 09:43 PM   #598
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Default Hi!

Nice amp, real Russian!!

Regards zeoN_Rider
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Old 17th November 2008, 11:02 PM   #599
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Default Re: Project A

Quote:
Originally posted by Mad optic
This is my 'Project A' amplifier. Single channel, Class A 20W, FETs.
...
Very creative layout and enclosure design, fantastic finish and assembly - congratulations!
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Old 18th November 2008, 08:47 AM   #600
Bonsai is offline Bonsai  Taiwan
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Wow - great looking result. My congratulations.
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