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Old 31st October 2008, 03:46 PM   #11
DimZ is offline DimZ  Greece
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just ordered the pcb parts (from george's list) from digikey ... except the sockets

cant wait .....
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Old 31st October 2008, 03:56 PM   #12
Pyre is offline Pyre  Canada
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Don't know if its any help to you but I was having trouble sourcing the 4 pin pcb mount sockets. I found that if you take the collar off a chassis mount tube socket the lugs fit right into the pcb holes. Not sure if this is common knowledge but it was a little epiphany for me.
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Old 31st October 2008, 04:05 PM   #13
N1ESE is offline N1ESE  United States
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Quote:
Originally posted by Pyre
Don't know if its any help to you but I was having trouble sourcing the 4 pin pcb mount sockets.
Although the topic of this thread says "Tubelab SE", I believe the jimazz is building the "Simple SE" as he referenced it in his opening post. The "Simple SE" doesn't use 4-pin output tubes but the "Tubelab SE" does.
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Old 31st October 2008, 04:12 PM   #14
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While I'm sure the 372JX is a very good power transformer, it is a 600VCT unit. You'll end up with a B+ somewhere around 350VDC. The 374BX is a 750VCT unit (more like 780VCT with no load on it) and will give you a B+ around 455VDC.

Either choice will make for a fine Simple SE power supply, but your choice may depend on what tubes you've selected for your outputs. If you intend to run 6V6, stay away from the 374BX. If you want to run KT88, I'd recommend the higher voltage to get the most out of your tubes.
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Old 31st October 2008, 04:12 PM   #15
DimZ is offline DimZ  Greece
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yeap its the simple se, sorry for the mess
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Old 31st October 2008, 04:17 PM   #16
DimZ is offline DimZ  Greece
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Quote:
Originally posted by Ty_Bower
While I'm sure the 372JX is a very good power transformer, it is a 600VCT unit. You'll end up with a B+ somewhere around 350VDC. The 374BX is a 750VCT unit (more like 780VCT with no load on it) and will give you a B+ around 455VDC.

Either choice will make for a fine Simple SE power supply, but your choice may depend on what tubes you've selected for your outputs. If you intend to run 6V6, stay away from the 374BX. If you want to run KT88, I'd recommend the higher voltage to get the most out of your tubes.
tho I have a pp with 6v6 i'm thinking of using kt88, so 374bx is better??
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Old 31st October 2008, 04:30 PM   #17
N1ESE is offline N1ESE  United States
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Quote:
Originally posted by jimazz
tho I have a pp with 6v6 i'm thinking of using kt88, so 374bx is better??
I'm using the 374BX on mine and I highly suggest you do the same (if available over there), as Ty suggested, to get the most out of the KT88's. Just don't use the 6V6's if the 374BX is wired in. The 374BX should be fine though, someone correct me if wrong, with EL34's and 6L6GC's along with the very lovely KT88's.
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Old 31st October 2008, 05:56 PM   #18
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For KT88 I'd suggest a 750VCT power transformer, such as the 374BX or Allied 6K7VG. I'm not sure the Allied would work for you - it needs 120 volt 60 Hz for the primary winding.

Make sure your power supply capacitors are rated for 500VDC. I'd probably avoid the solid state FRED rectifier diodes. The startup surge voltage is too high for my liking, and the output tubes get hit with a lot of B+ while the cathodes are still cold. Stick with a 5AR4 rectifier tube instead.

560 ohm cathode resistors work well for KT88 at this voltage. You could probably safely drive them harder with 510 ohm or 470 ohm cathode resistors too, although you're already pretty close to the rated current limit of the 374BX using the 560 ohm cathode resistors.
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Old 31st October 2008, 06:06 PM   #19
DimZ is offline DimZ  Greece
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Those are the capacitors as in george's parts list :


digikey part number /

P7442-ND / CAPACITOR 47UF 500V ELECT
http://search.digikey.com/scripts/Dk...?name=P7442-ND

P7451-ND / CAPACITOR 120UF 500V ELECT
http://search.digikey.com/scripts/Dk...?name=P7451-ND
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Old 31st October 2008, 06:08 PM   #20
DimZ is offline DimZ  Greece
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think thats a nice online store .....

http://www.tube-town.net/ttstore/pro...ond-374BX.html

any experience anyone ??
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