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Old 30th January 2013, 04:00 PM   #11
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these are not shown on the schematic? how can they be added to the old design?
There is no provision on the old PC board for these parts. It is easy to do off board, and I explained how in a thread somewhere.

You can add the diodes by soldering the anode of a diode to the end of each red wire on the power transformer and covering it with heat shrink tubing. The stripe (cathode) on the diode is the free end. It is inserted into the terminal strip on the PC board where the red wires were.

You can solder the CL-140 to the power transformers red/yellow wire and insert the other end into the boards terminal for the red/yellow wire. The CL140 has no polarity.

Both of these additions are for improving the reliability of the 5AR4 tube and do not affect the sonics of the amp. Ordinary 1N4007 diodes work fine since the characteristics of the tube rectifier prevail, but you can use fast rectifiers (FR4007) or other exotics as long as they are rated for at least 1000 volts and 1 amp.
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Old 30th January 2013, 04:09 PM   #12
neomat is offline neomat  France
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Thanks Russ and George for additionnal information. Do you know an equivalent for GE CL-140, but from EPCOS ?
I'm lost in specs, and I don't really know which is a real requirement... Moreover, GE thermistors are in stock in USA and shipping is $18+...

For resistors, I thought about inductive, or other disturbing effects, but if carbon film resistors are OK, no problem :-)
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Old 4th February 2013, 07:34 PM   #13
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Originally Posted by neomat View Post
Hi !

my purchase list :
- big CXSE25-8-5K Edcor OPT
- Edcor XPWR059 (750V (375-0-375) @ 175mA CT, 50V @ 50mA, 6.3V (3.15-0-3.15) @ 6A CT and 5V (2.5-0-2.5) @ 3A)

!
Hi, i am new here as well and i don't understand;
1. do i need 6.3v CT or just 6.3v
2. How much amper is to much? 6A, 8A
3. I bought 300b psvane how much voltage can i put on it?
4. Is Edcor XPWR032 (voltage windings, 800V (400-0-400) at 150mA center tapped, 12.6V at 600mA, 6.3V at 4A and 5V at 3A ) Ok?

Thanks you all,
Ran
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Old 5th February 2013, 12:36 AM   #14
rknize is offline rknize  United States
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I'm going to assume that you have a Tubelab SE and not the SSE.

1) CT on 6.3VAC is not required for SE if you are running 300Bs. It is required if you plan to run 45s.

2) 4A is the recommended minimum for 6.3V when using 300Bs. Less for 45s, more for 2A3.

3) George's recommendations for the 300B setup will give you around 350V on the 300Bs. I can't speak about the psvane, specifically.

4) That will give you way too much B+ for 300Bs.
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Old 5th February 2013, 01:43 AM   #15
cotdt is offline cotdt  United States
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You can put 450V on the Psvanes. Increase the current in the 5842 so you can adjust down the voltage, since B+ will be higher.
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Old 5th February 2013, 02:19 AM   #16
rknize is offline rknize  United States
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If you are going to run that much B+ on the TSE, be mindful of the capacitors' voltage rating and your selection of R14/R25 values (36k or more).
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Old 5th February 2013, 11:27 AM   #17
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Originally Posted by cotdt View Post
You can put 450V on the Psvanes. Increase the current in the 5842 so you can adjust down the voltage, since B+ will be higher.
thanks to all,

Cotdt ,
1. did you wrote this from your own experience or common knowledge?
2. you mean the 5842 plate voltage?


I must say thanks to George that beacuse of his great site i found a new hobby

p.s.
Do someone know were can i get the "Single Ended Amp Cad" program?
(it's out of stock in "Antique Electronic Supply")
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Old 5th February 2013, 11:56 AM   #18
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For the Tube CAD Program
GlassWare Programs
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Old 5th February 2013, 12:10 PM   #19
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quinnling, as long as i know GlassWare Programs send you to "Antique Electronic Supply" to buy the CD.
and they don't have it in stock.
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Old 5th February 2013, 12:51 PM   #20
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Originally Posted by Davec113 View Post
I would go with less than 47 uF for c1 unless you plan on buying a NOS 5AR4, the new ones will eventually arc over and fail. .
I bought 2 of these, with 1 in my SSE; they behave electrically just as 5AR4s.

5AR4 Rectifier Tube Mil Philips Mislabeled 5V4GA | eBay

Also, Eli Duttman posted this schematic for new production 5AR4s for keeping them alive
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File Type: jpg tuberectifier-diodemod1.jpg (106.0 KB, 240 views)
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