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Old 20th July 2012, 05:10 PM   #4211
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Quote:
Originally Posted by dady View Post
Hi Davec, is a piece of sculpture in exotic wood. I didn't imagine this kind of finish. Enhanced wife's factor. The white signal cables, did you make them? If is positive can you explain how to.
Best Regards.
The cables are from Jupiter, they sell the bulk cable here:

Cotton Insulated Cable

They are very good interconnects, I highly recommend. They are on the warm and bassy side, but not overly so...

@richwalters, so far so good, but I made a mistake with a resistor value in the heater power supply so heater voltage was too high. I shut it off after a couple hours to preserve my tubes and should have it fixed and running again in a couple days. From what I have heard so far I am sure I will be happy with it.
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Old 20th July 2012, 10:57 PM   #4212
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Originally Posted by Davec113 View Post
They are very good interconnects, I highly recommend. They are on the warm and bassy side, but not overly so...
If changing interconnect cable made audible difference, then it's either it was a bad cable before switching or after switching. Or there is something wrong with the amp / preamp. Cables, Interconnects and Other Stuff - The Truth
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Old 21st July 2012, 07:33 PM   #4213
cjkpkg is online now cjkpkg  United States
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Location: Roswell GA
New SE amp for the stable. Basically the JELabs EL34 which started from an abandoned 300b project. One of the 300b's hit the hard hard floor and that was that...it sounded OK but not sooo good that I felt compelled to get another tube or matched pair. Being that I had plenty of EL34 tubes kicking around and the amp was 90% there I figured what the heck.

Allied 6K7VG PT
James 6123 OPTs
Triad chokes
Auricap coupling caps
Broskie PS-1 heater supplies for the EL34's
JJ new issue E34L's
JJ new issue GZ34
Tung Sol new issue 6SL7's
Choke loaded grids for the power tubes


The only mod I really made to the circuit was replacing the resistor bias with red LED bias on the 6SL7's. I have preferred this mod on a few amps that I have built recently.

LED's running 1.72V which looks to be about 2.75mA for the 6SL7's
E34L's running at 76mA
B+ 405V

Speakers are Fonkens with CHR70's...

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Old 21st July 2012, 08:35 PM   #4214
cjkpkg is online now cjkpkg  United States
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Location: Roswell GA
OK...and even with the "rats nest" this amp is DEAD SILENT...

Using 5687 Aikido preamp Directv jazz channel is the typical listening
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Old 24th July 2012, 11:15 AM   #4215
kees52 is offline kees52  Netherlands
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Location: Sprang-capelle Holland.
Little old here but new life is always good.

what will do this speaker in a metronome?

I have four of them. in a H frame she do pretty good,
big bas, very clean two of them in one H frame.. the next step
is a damped U frame, but the metronome I want also test

Visaton - Lautsprecher und Zubehör, Loudspeakers and Accessories

the audio is faulty but you can here the bass, here I hade switch bandpass midd from low to high and not high to llow, coils and caps wrong connected.

http://www.youtube.com/watch?v=SvuHY...feature=relmfu

Last edited by kees52; 24th July 2012 at 11:20 AM.
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Old 24th July 2012, 01:04 PM   #4216
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Location: Victoria, Australia
Default Don's 6C33C

It took the best part of a day but I got Don's 6C33C up and going. This "beast" has four DC power supplies under the bonnet, two large chokes and two power trannies one for the 6C33C heaters (6A each). It is a three stage amp using a 6SL7 driver tube. The two triodes are connected by a cap but the second triode is connected direct to the 6C33C grid. The top plate is thick ABS plastic and the base Australian Spotted Gum. Dom makes all my bases now. He had the wiring for the 6SL7 completely stuffed so I had to pull all this down and rewire correctly. The amp played first time after the re-build and sounds absolutely fantastic. It has a lot of gain. It must be the best of Don's amps so far. I think he said 12WRMS per side for an SE!!!

You bias the 6C33Cs up to 220mA but at 150mA the power tranni got real hot. Also the filament toroid gets very hot too. The specs for these trannies requires some checking. Don had one bad 6C33C which had one plate (to in the bottle) glow red. I think only one plate was connected at manufacture.Lucky I have a box full of these big tubes and was able to drop one in and enjoy the music!!
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Old 24th July 2012, 03:00 PM   #4217
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Quote:
Originally Posted by cjkpkg View Post
New SE amp for the stable. Basically the JELabs EL34 which started from an abandoned 300b project. One of the 300b's hit the hard hard floor and that was that...it sounded OK but not sooo good that I felt compelled to get another tube or matched pair. Being that I had plenty of EL34 tubes kicking around and the amp was 90% there I figured what the heck.

Allied 6K7VG PT
James 6123 OPTs
Triad chokes
Auricap coupling caps
Broskie PS-1 heater supplies for the EL34's
JJ new issue E34L's
JJ new issue GZ34
Tung Sol new issue 6SL7's
Choke loaded grids for the power tubes


The only mod I really made to the circuit was replacing the resistor bias with red LED bias on the 6SL7's. I have preferred this mod on a few amps that I have built recently.

LED's running 1.72V which looks to be about 2.75mA for the 6SL7's
E34L's running at 76mA
B+ 405V

Speakers are Fonkens with CHR70's...
Looks great, I really like my EL34 SET. I also used the James OPTs. Recently, I did the "Hazen" Mod, strapping g3 to cathode using a .1 uF film cap in place of a jumper wire. It is worth trying IMO.
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Old 24th July 2012, 05:23 PM   #4218
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Here is my cheap headamp, it is 24V supplyed tube with mofsets on the ends.
I stucked it between the glass sheet, so now evrybody can see my gross soldering and first eagle pcb. It plays good, but I can't get totally rid of mechanical hum, which is spreading through the glass very eficiently. This glass was quite cheap too, because I cutted and drilled it mysel except lamp hole and corners which costed me about 2e...
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Old 27th July 2012, 08:26 AM   #4219
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Old 27th July 2012, 10:34 AM   #4220
dady is offline dady  Argentina
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Quote:
Originally Posted by kallamash View Post
Here is my cheap headamp, it is 24V supplyed tube with mofsets on the ends.
I stucked it between the glass sheet, so now evrybody can see my gross soldering and first eagle pcb. It plays good, but I can't get totally rid of mechanical hum, which is spreading through the glass very eficiently. This glass was quite cheap too, because I cutted and drilled it mysel except lamp hole and corners which costed me about 2e...
Click the image to open in full size.
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Yes Friend there are no pics. Something unexpectedly could happen with them.
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