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Old 3rd November 2011, 12:27 PM   #1371
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Hi Felipe,

Panasonic TSHA will be very good choice.
FW rectifier is also good.
2mH chokes will be useful, and yes about 0,47 ohm.

enjoy the build, and let us know !
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Old 3rd November 2011, 01:00 PM   #1372
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Sorry for a lot of questions (I wanna be sure I'm doing):

For snubers I have 100nF 1Kv Epcos I don't know MKT or MKP & Philips 100nF 400V, I mind are better high voltage? about 47R wich wattage?
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Old 3rd November 2011, 01:32 PM   #1373
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They should be OK.

OR 100nF arcotronics 630V is very cheap: Farnell 1679391.

High voltage is perfect for snubbers.

resistor 0,5W is OK.

..
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Old 3rd November 2011, 02:36 PM   #1374
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About snubbers for B+ 100R also 0.5W? for 47nF I will use Philips MKP 1000V that I have on hand.
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Old 3rd November 2011, 02:46 PM   #1375
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0,5W is OK.

For the very best, I recommend Arcol Carbon Composition in this position. Minimized inductance for best damping of pulses.

RS stock code 386-345
farnell 1265066

These 100 ohm compo are the best type for power valve grid-stoppers (again, minimal inductance), so stock up if you are buying anything else.
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Old 3rd November 2011, 02:58 PM   #1376
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Thanks for support, I will order Arcol 0.5W 100R & 47R to RS minimum quantity 25 resistors of each value

For 1Meg at the input instead the volume Pot I have two Shinkoh's 2W are good?
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Old 3rd November 2011, 03:02 PM   #1377
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Felipe, use 100 ohm in both positions (value is not critical, unless you measure the current pulse as described earlier), and for grid-stoppers on big valves. You will use all 25 then!

I have not tried Shinkoh.
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Old 3rd November 2011, 03:07 PM   #1378
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Shinkoh's are tantalum, what kind of 1 MEG are you tried in the same position with good success (input to gnd before the 100nF in your schematic)?
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Old 3rd November 2011, 04:12 PM   #1379
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I have used Welwyn PWC - but these are chip resistors, and harder to use.

Tantalum should be good - try these first!
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Old 3rd November 2011, 04:36 PM   #1380
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Ok I will try tants, now I have to wait to arrives RS order.

For B+ I want to use Cree rectifiers Schottky Diode,Z-Rec,SiC,4A,600V,TO-220 (it's necesary the snubber):

Compre Rectificadores Schottky Diode,Z-Rec,SiC,4A,600V,TO-220 Cree C3D04060A en RS Online y lo recibir en 24/48 horas.
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