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Old 2nd October 2008, 11:26 AM   #1
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Default Simple SE Schematic

Has anyone got a copy of the simple se schematic from tubelab.com? I am having difficulty with my amp as it is constantly blowing fuses on start up and I would like to take it to a friends who has neither internet nor a pc. I have seen the schematic on tubelab.com website but the values are far from clear (by that I mean the print is fuzzy).
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Old 2nd October 2008, 01:23 PM   #2
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I have a PDF schematic but it is too big to attach to a post on this forum. Send me an email and I will reply with the schematic. If you were the person that recently sent me an email requesting a schematic, it is coming soon.

My computer died last weekend. Fortunately I was smart enough to have it all backed up this time (I lost my entire web site 2 years ago), but retrieving almost 1 terrabyte over USB takes a while. I may be able to send the schematic tonight, worst case this weekend.

Does the fuse blow instantly on turn on every time? If so the problem is likely in the solid state diodes. If you are always using a tube rectifier, remove the diodes. They are only used in the SS rectifier mode. There have been some failures with the IXYS parts. This appears to be batch related, some never die 9the older ones) but there have been some recent failures.

Does the fuse blow after a few seconds, and not necessarilly every time? It could be the 5AR4, especially if you are using JJ.
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Old 2nd October 2008, 01:56 PM   #3
nhuwar is offline nhuwar  United States
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1 tb over usb, WOW talk about a glutton for punishment.
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Old 2nd October 2008, 06:22 PM   #4
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George,
It does blow the fuses instantly. I will only ever be using tube rectifiers, is it just a case of removing the diodes and not replacing them with anything?
It was me that emailed for the schematic and I would still appreciate the pdf if and when you can get around to it. Good luck with the 1tb transfer, it will take a lot of coffee to get it done.
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Old 2nd October 2008, 06:51 PM   #5
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Quote:
is it just a case of removing the diodes and not replacing them with anything?
Yes, leave them out.

Quote:
It was me that emailed for the schematic
If I get home from work early enough tonight, I will do it, but probably over the weekend.

Quote:
Good luck with the 1tb transfer, it will take a lot of coffee to get it done.
Most is done already, but I want to keep the mess from getting disorganized. My new machine has over 2 TB of storage capability. A 1TB drive is now $129 USD. I am slowly copying all of my CD's to the 1TB drive. I play music with new modern 24 bit 192 KHz technology feeding a pair of 77 year old vacuum tubes, a Tubelab SE with NX-483 tubes.
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Old 2nd October 2008, 07:01 PM   #6
nhuwar is offline nhuwar  United States
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Quote:
Originally posted by tubelab.com


Yes, leave them out.



If I get home from work early enough tonight, I will do it, but probably over the weekend.



Most is done already, but I want to keep the mess from getting disorganized. My new machine has over 2 TB of storage capability. A 1TB drive is now $129 USD. I am slowly copying all of my CD's to the 1TB drive. I play music with new modern 24 bit 192 KHz technology feeding a pair of 77 year old vacuum tubes, a Tubelab SE with NX-483 tubes.
Ya the price of drives makes my 230gb raid 5 scsi ultra 160 look pathetic.

I need to upgrade LOL.
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Old 2nd October 2008, 08:33 PM   #7
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So to clear it up, I simply remove D1 and D2? Sorry for asking what is probably sill questions but I am if you hadn't already guessed the mother of all newbies.
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Old 2nd October 2008, 09:27 PM   #8
Zap is offline Zap  United States
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Yeah, you just need to remove those two parts - they don't do anything when using the tube rectifier. You've probably got one that has failed and is shorted.

I haven't had a failure with mine, but I know a few other Simple SE builders have had them go bad.
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Old 2nd October 2008, 09:56 PM   #9
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Quote:
So to clear it up, I simply remove D1 and D2?
Yes, they are only used for the solid state rectifier option.

Quote:
but I know a few other Simple SE builders have had them go bad.
They have zapped in Tubelab SE's as well. I bought 50 of the IXYS diodes about 5 years ago and never had an issue. I got 100 from Digikey about a year ago and several have blown without provocation even in low (150 volt) voltage applications. The diode blows when the amp is turned off, which then blows the fuse the next time the amp is turned on.

The IXYS diodes are not "avalanche rated" which means that they can not handle transients that go over 1200 volts in the reverse direction. This can happen in some cases on amp turn off. Some batches of diodes can dissipate these transients, while others fail. There are "avalanche rated" diodes that can deal with thiss effect.

I am investigating some Fairchild "Stealth" diodes. The number is ISL9R8120P2. I have been told that "even I couldn't blow them up". So far that statement is true, but these guys aren't cheap.

I have a list of other, lower cost diodes to try, but health issues have limited my Tubelab time lately.
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Old 4th October 2008, 02:34 PM   #10
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George,
That worked a treat no more blown fuses, however neither the rectifier nor the output transformers are getting any power???? Any ideas??
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