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Old 24th December 2012, 02:22 PM   #1
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Default HELP : what wattage for resistor ?

Dear all,
I am building up a phono/line/hearphones preamplifier based on the ptsoundlab schematics.

I putted the schematics as an attachment.
It took me time to purchase all the right parts and I am already there.

Regarding resistors, i am thinking about Kiwame, and i am wondering which wattage to choose for the resitors with no indication on the schematics...
My gess is : Is it possible to fit 2 watt resistor for all the resistors ? I beleive I can put some 5 watts everywhere but the price would be much higher...

Thank you for your precious help. I'll be glad to share my experience on building this nice pretty thing with who ever would need it.
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Old 24th December 2012, 02:33 PM   #2
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Half-watt unless the schematic shows otherwise.
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Old 24th December 2012, 03:04 PM   #3
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Thank you for such a quick answer !

I have another question, i grab the opportunity
Here is again the schematics of the Stage Line.
You'll notice, on the ECC99 zone, there is a 0,5uf paperoil capacitor with no voltage indication.
I bought this product (see attachment): 0,5uf, 160v PIO.

Would you say this high voltage could cause any problem ?
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Old 24th December 2012, 03:54 PM   #4
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Probably okay. Low frequency circuits like audio, the extra size doesn't usually cause much inductance problems. This spot shouldn't go above 50v, or whatever the performance chart on the tube shows the grid voltage pinching off gain.
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Old 24th December 2012, 04:50 PM   #5
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ok thanks
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Old 24th December 2012, 06:07 PM   #6
Pano is offline Pano  United States
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Fredericasse, do you have permission from ptsoundlab.com to post those schematics here? Are they copyrighted?
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Old 24th December 2012, 11:36 PM   #7
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if the website would still existing, i would not have post it !!!
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Old 25th December 2012, 11:21 AM   #8
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Do you think it is interresting to separate the power supply from the preamp ?
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