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Old 28th February 2009, 04:26 PM   #2411
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"stone" rearpanel just after CNC.
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Old 28th February 2009, 04:28 PM   #2412
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and all together
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Old 28th February 2009, 09:35 PM   #2413
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audiomanics: = Very cool ...
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Old 28th February 2009, 09:42 PM   #2414
56oval is offline 56oval  Australia
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Quote:
Originally posted by afrench
Yes good point!

Might hold off on the paint idea for a bit.
Hello Afrench.

You could use a VHT paint used for high temp ,mostly used in the Auto industry and comes in a areosol can.

Cheers
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Old 28th February 2009, 10:57 PM   #2415
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Quote:
Originally posted by afrench
Hi, thanks for the comments!

OPT covers are just 5mm MDF (about 1/4 inch) glued together, and painted using a Hammer finish paint!

Am thinking about painting the other transformers to match - the factory finish is not that good - but this means not being able to use the amp for a night or two!
Like the MDF covers... They look cool with the Hammer finish!

I have built some wooden covers for OPTs too!
Just need some extra care with the painting.

If you're power transformer don't warm too much, you can paint it with the same finish. I don't think it will stink.
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Old 28th February 2009, 10:59 PM   #2416
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Quote:
Originally posted by azazello
One stage OTL Headphones ampl. with wonderfulll russian triode 6C45 /6S45P, Ri=1.15 kohm to 300 ohm Zenheizer HD580/, Amazing sound from 1 tube and 6 passive elements per channel. Ia=20 ma, Uinput = 1,5 v.
Grid res. to ground 1 mohm, cathode resistor 75 ohm/1wt /parallel cap.
1000 mkf - Nichikon, -U=1,5 v./, anode res. 3,3 kohm/5 wt. PS - 180 v.
Output cap 100 mkf/450v- Elna. /Res. output to ground- 15 kohm/.
Volume control - 10 kohm. PS - rect diodes BYV26E, CLCLC filter.
If use 2 tube in parallel /Ri = 550 om to 300 ohm HPh.- very good stick,
and great sound!/.
http://picasaweb.google.com/azazello...62638572496706
Nice vintage look Azazello!

audiomanics, good job. Pro!
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Old 5th March 2009, 07:32 PM   #2417
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Mark, Great idea with the microswitch on the volume control shaft!
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Old 13th March 2009, 02:21 PM   #2418
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Hallo to all tubebuilders!
This is my first post on diyaudio, and this is my second brand new amplifier!

technical data: SE, UL, 6L6WGB, 250V, total reservoir capacitance 1400uF R-C smoothing filter , 180ohm cathode resistor (for -14V autobias), 2,5K OPT, coupling capacitors MKT, 12AX7 driver, 22K NFB (light), star grounding at the screw of 12AX7 noval socket, wooden box from IKEA (p/n 600.512.99 - 3.00 euros).

possitve impressions: powerfull for domestic use, pleasant, excellent mids, nice lows, nice looking (?), compact size.

negative impressions: some 100Hz noise (choke is necessary for up to 1400uF - at least), strange highs, absolutely dangerous constraction! purelly Electroshocked!
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Old 13th March 2009, 08:38 PM   #2419
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Congratulation!
__________________
Projects: OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,... PPs 6005 Gen. Electric, EL34 Mullard, 6L6....
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Old 15th March 2009, 01:01 AM   #2420
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I just finished a SE amp based on Mikael Abdellah's KT88 design.

I am using Sovtek 6L6WXT+ at 60 mA into Edcor GXSE 15-6-5k output
transformers. I added a cathode bias trim for each tube by putting
470 ohms in parallel with a 2W 200 ohm potentiometer. The testpoints
are across 1 ohm to measure the current.

It is selectable between anode and UL, although I have found myself
enjoying the UL more at the moment.

This was made entirely with (cheap) hand tools.

From the front:
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