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6EW7 Dc coupled SET OPT Headamp - Page 2

post #16 of 21
2/17/10 at 3:50pm
Really a dumb question, the LED is supposed to be the other way, isn't it ?
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post #17 of 21
2/17/10 at 10:35pm
Thread Starter 
Quote:
Originally Posted by bidoux View Post
Really a dumb question, the LED is supposed to be the other way, isn't it ?
Yea its backwards, I'm using Paint and hit invert instead of rotate, will fix it in the morning.

Thanks

Quote:
Originally Posted by Parafeed View Post
Regal, if you go with the ultrapath configuration make sure you use a "decent" poly or oil cap, not the cheapest electrolytic you can find.
For the ultrapath cap I called out ASC oil caps which should be much better than electrolytics.
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post #18 of 21
2/18/10 at 7:40am
Thread Starter 
Fixed the LED, also the load line indicated that this tube is optimum with a 7500k primary impedance, will find out if this adds cost to the OPT's.



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post #19 of 21
2/19/10 at 6:51am
Thread Starter 
Looking closely at the datasheet it looks like a 7.5k primary will be best for this tube. I'm estimating total cost under $700. Two hammond 370AX transformers will work (one each channel) to power the Broskie PS-2's. A 12V transformer will power a LM1085 filament supply (wire the heaters in series.)
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post #20 of 21
2/19/10 at 7:40am
could you use a gyrator instead of the plate css? some people prefer the sound. see here

Anti-Triode SEPP, how to do best? - diyAudio
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post #21 of 21
2/19/10 at 10:31am
Thread Starter 
Quote:
Originally Posted by adamus View Post
could you use a gyrator instead of the plate css? some people prefer the sound. see here

Anti-Triode SEPP, how to do best? - diyAudio

The DN2450 version looks easy enough to try, I'll do a comparison when I build ths.
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