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Old 22nd April 2010, 07:18 PM   #111
torsken is offline torsken  Norway
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Quote:
Originally Posted by flocchini View Post
Oliver:

I forgot to mention that my RCore transformer was putting out 270V so I put some 33K resistors in the anode line. Gives 210V to the 6H2P. Is this OK or should I drop the voltage more.

In general I have found that the RCore transformers run a bit higher than stated.

Best

Bob
Where is the best place to put these resistors?

Thanks
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Old 22nd April 2010, 08:21 PM   #112
joemana is offline joemana  United States
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[QUOTE=flocchini;
I posted my pix of the 6SN7/6H8C setup I put together. It takes both phases (+ and - ) and inputs SE. It sounds great. Right now I am switching between this set-up and my Lundahl 1674 transformers. the transformers also sound very good and make for a nice compact system.


Hi Bob,

If you have to pick one which is the better on all of what you've tried so far?

Thanks,

Joe
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Old 22nd April 2010, 08:53 PM   #113
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Quote:
Originally Posted by torsken View Post
Where is the best place to put these resistors?

Thanks
I put them in place of the B+ jumpers that appear on the left side middle of the board.
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Old 22nd April 2010, 08:55 PM   #114
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[QUOTE=joemana;2162857][QUOTE=flocchini;
I posted my pix of the 6SN7/6H8C setup I put together. It takes both phases (+ and - ) and inputs SE. It sounds great. Right now I am switching between this set-up and my Lundahl 1674 transformers. the transformers also sound very good and make for a nice compact system.


Hi Bob,

If you have to pick one which is the better on all of what you've tried so far?

Thanks,

Joe[/QUOTE]

Joe:

I am using the 6SN7 set-up. Right now it appears a bit fuller with more punch

Enjoy

Bob

that should have read outputs SE
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Old 23rd April 2010, 05:48 AM   #115
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Quote:
Originally Posted by torsken View Post
Where is the best place to put these resistors?

Thanks
You could also rise the value of the two 1K resistors in the anode supply
directly.


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Old 23rd April 2010, 06:00 AM   #116
toufu is offline toufu  United States
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Quote:
Originally Posted by flocchini View Post

Joe:

I am using the 6SN7 set-up. Right now it appears a bit fuller with more punch

Enjoy

Bob

that should have read outputs SE
Hi Bob, I might have missed your picture of the 6SN7 setup, can you direct me to it? I might want to try that too... Thanks!
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Old 23rd April 2010, 06:17 AM   #117
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The pix of the 6SN7 is in post 102 (this thread).

I have a bunch of 6SN7 tubes so it was a logical choice. It does use the V+ and V- outs of the Buffalo and gives an SE output. I used Oliver's board for the power supplies and the ground plane and as a base for the Amphenol 8 pin tube "test bench". Hard-wired the circuit to that.

I recently replaced the PIO output caps with Mundorf Silver/Oil and a .1μF Russian Teflon. I think this gave the sound more body and punch.

Best

Bob
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Old 23rd April 2010, 06:41 AM   #118
torsken is offline torsken  Norway
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Quote:
Originally Posted by flocchini View Post
I put them in place of the B+ jumpers that appear on the left side middle of the board.
Thanks. Yes, that seems to be a natural place to put them. I tried some 27,5k resistors and that gives me around 210v at the anode.
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Old 23rd April 2010, 06:50 AM   #119
torsken is offline torsken  Norway
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Quote:
Originally Posted by dvb-projekt View Post
You could also rise the value of the two 1K resistors in the anode supply
directly.


Thanks. If 27,5k + 1k gives me around 210v then I guess I need a resistor around 33k in this position to get a voltage between 180-200v?

Do you think this way of doing it will be preferable sound vice compared to adding two resistors in the anode line?

Sorry for the noob questions but I'm new to this hobby.

Last edited by torsken; 23rd April 2010 at 06:54 AM.
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Old 23rd April 2010, 05:18 PM   #120
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Quote:
Originally Posted by torsken View Post
Thanks. If 27,5k + 1k gives me around 210v then I guess I need a resistor around 33k in this position to get a voltage between 180-200v?

Do you think this way of doing it will be preferable sound vice compared to adding two resistors in the anode line?

Sorry for the noob questions but I'm new to this hobby.
If prefer one resistor buy you could also do it with two in series.
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