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PostPosted: 12 Jan 2016, 16:57 
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Joined: 30 Oct 2015, 07:44
Posts: 82
Forgive my ignorance but I've been tinkering around with a couple supply designs using the Hammond PSU II tool. As I've mentioned, for visual appeal alone I'm interested in the ST bottles and trying to come up with something that will work for my KT88 SE project. While simulating different rectifiers I see that the tool makes a distinction between 5U4G and 5U4-G. I honestly have tried to surf the web for info but I'm not seeing any definitive information. Is this perhaps an error?

Thank you for the consideration.

5U4-G
PIV - 1550V
IFSM - 99A
IFRM - 0.8A

5U4G
PIV - 1000V
IFSM - 10A
IFRM - 2A


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PostPosted: 12 Jan 2016, 18:38 
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Joined: 06 Apr 2009, 10:08
Posts: 1620
Location: US Pacific Northwest
The tool looks messed up.

All 5U4s have a 1550 PIV. The 5U4G (5X4G, 5Z3) has a SSPPC of 675mA. However, Sylvania rated their 5U4G with a SSPPC of 800mA. The 5U4GB SSPPC is 1000mA (1A). Transient peak plate current for the 5U4G is 4A. For the 5U4GB, it is 4.6A. The voltage drops are different. See the data sheets or the table in my article for details.

This is one of the reasons I don't like canned tools and SPICE. You can never be sure of what is in the component models and how the calculations are preformed.

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PostPosted: 12 Jan 2016, 21:23 
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Joined: 30 Oct 2015, 07:44
Posts: 82
I thank you,

I had thought that the rectifiers would have been rather solidly baked in the off-the-shelf tools. This will make a little more work for me but I'll be better for it. I wasn't sure if there was a variation of the tube that I wasn't aware of yet.

Thanks!


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PostPosted: 16 Jan 2016, 19:54 
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Joined: 24 Nov 2015, 04:55
Posts: 19
Location: San Francisco, CA
Since we're on the subject of rectifiers...
I have a mystery rectifier that I hope someone can identify. I've posted some pictures. Other than 5R4WGB, I don't have any other octal rectifiers to compare this one to. Most of the markings have been rubbed off, but I can see that they are orange, so I'm thinking maybe RCA. The plates are about 2" long. The internal structure looks significantly different to that of the 5R4WGB "potato masher". I suppose that it could be a non-"WGB" version. I tried comparing it to pictures found on the web, but it's really hard to tell. The getter ring is on the side, between the two plates. It has triple mica insulators, so probably military. And it looks to be unused.


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PostPosted: 16 Jan 2016, 20:37 
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Joined: 04 Jun 2008, 20:59
Posts: 4097
Location: Arizona, USA
Hi, It looks like a 5U4GB to me.

Good listening
Bruce

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PostPosted: 17 Jan 2016, 19:32 
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Joined: 06 Jun 2008, 18:23
Posts: 5188
Location: Australia
Because the 5U4GB is the only tube which doesn't flash-over in my 300B amp I bought two NOS NIB Silvanias to use in it. I am yet to try them. My 300B burnt out its power tranni. I have an Edcor one to replace it.

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