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Old 20th September 2011, 02:42 PM   #161
gkn202 is offline gkn202  Luxembourg
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Quote:
Originally Posted by Alastair E View Post
Hmm....

That aint much use --Without a Schematic!

All I get is a page of meanigless numbers and another page asking what program it needs to open it!

At least mine WORKS in the real world, with real tubes! Ive never put much faith in simulations, Especially with Tube circuits, Sims never seem to hold up!

Any chance of a scheme we can look at??
hmmm...

just the schema, here it is... I've also posted a ZIP with the model and its library.

Gary
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Old 2nd October 2011, 05:29 PM   #162
M Gregg is offline M Gregg  United Kingdom
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Just some more progress,
Just for fun.

Driver/preamp board.

I wanted to compress it into a small area away from the 6c33c's.
So point to point wiring.

Just connections for the IRF710 to do.

Feedback is via PTFE home made screened cables.
Bias supply cap is Rubycon HV.
Coupling cap is Jupiter, Amtranz.
Takman resistors.

Heaters should be DC for the pre/ 6SN7's if all goes well!
and AC for the 6SL7.

Heater cables run across the back of the board to shield them from the pre circuits.
The board only provides screen no signal transfer. star Gnd.

Still on going, lots to do!


Regards
M. Gregg
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Old 2nd October 2011, 06:05 PM   #163
M Gregg is offline M Gregg  United Kingdom
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Regards the 6SL7,

Neon protection for the DC coupled stage.(grid cathode) has been fitted!

Just for interest the top plate shields the tubes from the Heater cables.

Alastair,

What voltage do you have on the anode of the driver tube?

(6SL7) in my circuit. So I can check the bias point, thank's.

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M. Gregg
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Old 2nd October 2011, 08:17 PM   #164
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I have about 120V on the anode, and a little less on the grid of the phase-splitter...

Sounds like you're nearly there!
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Old 2nd October 2011, 08:33 PM   #165
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by Alastair E View Post
I have about 120V on the anode, and a little less on the grid of the phase-splitter...

Sounds like you're nearly there!
Thank's,

I still have to complete the 6c33c wiring...

Also mount the FETS. A bit busy at work at the moment.
Its getting there.LOL

Regards
M. Gregg
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Old 3rd October 2011, 09:09 PM   #166
M Gregg is offline M Gregg  United Kingdom
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Just more progress,

Driver/ pre board completed.




Regards
M. Gregg
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Old 5th October 2011, 08:33 AM   #167
M Gregg is offline M Gregg  United Kingdom
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Post 162#

Error - S's & N's....late night...lol

Should say DC heaters for the 6SL7's and AC for the 6SN7.

Markings are wrong on pic 2 should have 2x 6SL7 and 1X 6SN7.
Now corrected

Wiring is correct to schematic. <<< accepting numbers for pin out should be 6SL series tube.

Back on track I guess...

Regards
M. Gregg
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Old 5th October 2011, 11:30 AM   #168
M Gregg is offline M Gregg  United Kingdom
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Just to show correctly.






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M. Gregg
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Old 6th October 2011, 01:56 PM   #169
M Gregg is offline M Gregg  United Kingdom
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Just some more progress






Regards
M. Gregg
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Old 6th October 2011, 05:48 PM   #170
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Very inspiring thread.

Getting the itch, must not start another build

A nice toroid for the input tubes HT and heater perhaps ?

Then its all toroid powered.

The amp is looking good !!
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