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| | |-+  Changing a rectifier tube question...
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Author Topic: Changing a rectifier tube question...  (Read 8053 times)
mcinku
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« on: November 13, 2007, 04:19:35 AM »

It's my Champ again   Tongue

...as I moded it to take a 6L6 tube I was thinking, what would happen if I swap the stock 5Y3 rectifier tube with something bigger like 5U4 for example. Would that be a stupid idea?


I sure don't want to blow up my Champ.
 Wink
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ChrisL
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« Reply #1 on: November 15, 2007, 01:16:40 AM »

I'm no expert but it just depends on the amp and it's components.  There is a lot of speculation on the subject.  The 5Y3 will drop more voltage than a 5U4 so you are going to have a higher B+ so you will probably have to adjust your bias resistor value.  Also, a 5U4 has a higher capacitance value so your power cathode cap should be doubled.
The most important spec to check is how much draw your PT can safely handle.  A 5U4 requires a full amp more than your standard 5Y3.

Also, consider a 5V4....similar "less sag" characteristics as a 5U4 without the extra amp of current draw.

I hope you don't have a sovtek 5Y3 in there now.   Shocked
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mcinku
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« Reply #2 on: November 15, 2007, 01:20:17 PM »

I'm no expert but it just depends on the amp and it's components.  There is a lot of speculation on the subject.  The 5Y3 will drop more voltage than a 5U4 so you are going to have a higher B+ so you will probably have to adjust your bias resistor value.  Also, a 5U4 has a higher capacitance value so your power cathode cap should be doubled.
The most important spec to check is how much draw your PT can safely handle.  A 5U4 requires a full amp more than your standard 5Y3.

Also, consider a 5V4....similar "less sag" characteristics as a 5U4 without the extra amp of current draw.

I hope you don't have a sovtek 5Y3 in there now.   Shocked


Thanks for your input.

I actually replaced the sovtek 5Y3 with some Russian NOS 5Y3. This sovtek rectifier was making some noise I didn't like.
BTW what is wrong with the sovtek 5Y3?
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ChrisL
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« Reply #3 on: November 16, 2007, 07:17:42 AM »

 The Sovteks don't have the same characteristic 60 volt drop @ 125 mA DC as a typical 5Y3 so by specs they aren't a 5Y3.    Watch your B+.  Their designs are very different as well and I think Sovteks  decision to call it a 5Y3 was a "sneaky" thing to do...lol
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Alpedra
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« Reply #4 on: November 29, 2007, 12:36:41 PM »

And thats why I have a 5Y3WGTA  JAN/Philips NOS on my 5E3 Wink
« Last Edit: November 29, 2007, 12:39:25 PM by Alpedra » Logged

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