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Old 13th May 2010, 12:32 AM   #131
joemana is offline joemana  United States
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[QUOTE=dvb-projekt;
have you adjust the heater voltage to 6,3V at the measuring point on the left side from the heaterswitch?[/QUOTE]

Hi Oliver,

I used it at 12.6V maybe that is the reason why. I'll adjust it to 6.3V and will try if that will fix the problem.
Thanks,

Joe
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Old 13th May 2010, 07:47 AM   #132
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Quote:
Originally Posted by joemana View Post
Hi Oliver,

I used it at 12.6V


So the heaters runs at 200%... I hope you dont damaged your tubes.

If you still have these pops, try to change the tubes to new ones.


Best,
Oliver
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Old 15th May 2010, 01:54 AM   #133
joemana is offline joemana  United States
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[QUOTE=dvb-projekt;2185577]:
So the heaters runs at 200%... I hope you dont damaged your tubes.
If you still have these pops, try to change the tubes to new ones.

Hi Oliver,

The tubes are still working. I will find out tommorow if it will make the loud pop. I'll be recieving the 6n6p soon and I might stick to that due to low gain.
Right now I don't have the switch or jumper, once I replace the tube with 6N6P, do I need to put the jumper on the 6N2P trace side or just leave it open?
Thanks for your help.

Joe

Last edited by joemana; 15th May 2010 at 01:59 AM.
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Old 15th May 2010, 06:45 AM   #134
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Hi Joe,

if you use the 6N6P you must close the jumper (switch set to 6N2P)!

Best,
Oliver
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Old 18th May 2010, 10:22 PM   #135
toufu is offline toufu  United States
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Hi Oliver, are you going to have more boards soon? By the way, would it be possible to make the tube socket holes a bit larger for the sockets with larger leads? Thanks!
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Old 19th May 2010, 05:18 AM   #136
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Hi toufu,

the next boards are in production, so yes!

Ill keep your wish about the holes in my mint for a next revision.


Regards,
Oliver
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Old 19th May 2010, 11:15 AM   #137
Pilsern is offline Pilsern  Norway
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Hi Oliver,

Thanks for the PCB.

How crucial is the voltage rating on the capacitors in tha anode supply?
Can i use capacitors rated 385 V or 400 V in the 220uf/450V spot?

What about the output capacitors? is 250 V sufficient?


Thanks again,

Pilsern
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Old 19th May 2010, 05:07 PM   #138
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Hi Pilsern,

i would recommend around 2* B+ (under normal load) for the output caps.
Same to the caps in the anode supply. Than youre on the absolute save side.


Regards,
Oliver
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Old 19th May 2010, 05:23 PM   #139
srinath is offline srinath  United States
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Hey,
This board is to do a tube output stage out of a TDA1541 dac ? Can I use it on a Toshiba TC9237BN dac ? how to modify it for that.
Thanks.
Srinath.
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Old 19th May 2010, 06:13 PM   #140
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Quote:
Originally Posted by srinath View Post
Hey,
This board is to do a tube output stage out of a TDA1541 dac ?
Yes!

Quote:
Can I use it on a Toshiba TC9237BN dac ? how to modify it for that.
I dont know this DAC Chip, but why not.

Perhaps someone else can help?
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