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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 14th December 2009, 11:47 AM   #11
jea is offline jea  United States
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Interesting! I have been looking at building a 45SE amp. Been looking hard at the Bugle circuit and still may build it. But now I have options.
Keep us posted.

jea
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Old 15th December 2009, 12:22 PM   #12
operksoy is offline operksoy  United States
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Kevin, thanks! I am considering building a pair of horns to go with this amp but have not decided what to build. I would appreciate any suggestions.
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Old 15th December 2009, 12:28 PM   #13
operksoy is offline operksoy  United States
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Thank you Russ! Your posts in the other threads helped me a lot. I must admit that the pictures on your blog inspired me with the side hanging silicons. Installing the capacitors on the back side of the PCB was straightforward but the regulator, mosfets and diodes were getting me concerned. It eventually came together pretty well.
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Old 15th December 2009, 07:16 PM   #14
rknize is offline rknize  United States
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No prob...yeah it takes a little creative lead-bending but it can be done!
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Old 30th November 2018, 10:01 PM   #15
phas10eezy is offline phas10eezy  United States
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will XPWR224 work for tubelab se 45? 270-0-270 VCT 125mA; 6.3V/3A CT; 5V/2A. These are the specs at the tubelab site, however am not sure if the 6.3V winding has enough current at 3A. Don't 45 tubes require 1.5A and 5842 0.3A... that adds up to 3.6A requirement for the 6.3V secondary.
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Old 2nd December 2018, 01:59 AM   #16
Tubelab_com is offline Tubelab_com  United States
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the XPWR224 is close, but I would look for a bit more current on the 6.3 volt winding. The conversion from AC to DC and the regulator both waste some power so that the actual current drawn from the transformer is a bit more that what the tubes alone draw.

That said I use these:

Hammond Manufacturing - 6K56VG - TRANSFORMER; PRI:110-120V; 50/60HZ; 540VCT @120DCMA; 5V @3A; 6.3V @3.5A; LEADS - Allied Electronics & Automation

Which are rated for 3.5 amps and seem to do OK. I did have one of these die, but it died because of rust. A window leaked during a hurricane and the transformer got doused in a lot of water. I didn't realize this at first, and the amp worked so I used it. Then one day I saw "smoke" coming out of the transformer. I realized that the smoke was really steam, so I took the transformer apart. It was really wet inside, so I baked it in the oven for a while to dry it out. It recovered but died a few months later. Autopsy revealed some internal rust and it was still wet inside. The replacement is still in the amp and working well 11 years later.

The Xpwr131 was specifically designed for the TSE, and can be used for either 45's or 300B's. It is another option.
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Old 3rd December 2018, 07:13 PM   #17
phas10eezy is offline phas10eezy  United States
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Thanks George for the response. Looking at XPWR009 instead then. Power transformer for a 120V, 60Hz. line to 550V (275-0-275) at 175mA center tapped, 6.3V at 4A and 5V at 3A.
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Old 3rd December 2018, 11:07 PM   #18
colnago55 is offline colnago55  United States
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For the extra 10 bucks you can get the XPWR131 which has been used with success by many of us on this forum. It also gives you the option of trying 300b's at some future date.

Just a suggestion.

Have fun with your project, Jacques
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Old 3rd December 2018, 11:16 PM   #19
phas10eezy is offline phas10eezy  United States
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Yes, I ended up ordering the XPWR131 after all. Thank you all for the input.
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Old 20th December 2018, 11:47 PM   #20
phas10eezy is offline phas10eezy  United States
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Hi all, just built TSE 45. want to add auxiliary capacitor [80uf/370v motor run]. My question is how do I wire it to C5? is it direct wire-in into C5 pads or some other way?


Also did the check out and I get these number; are they ok or should I try to lower B+ some? I'm using XPWR131, Triad CX14 choke, JJ GZ34 rectifier; rest of filtering components are as spec'd by George.


310V B+
175 B-
302V Plate voltage on 45 tubes
2.1V filament supply, kind of low? should be closer to 2.5, correct?
5842 plate at 175V
45 tubes biased at 27mA


Also just read that TSE boards will no longer be made due to the difficulty in acquiring certain parts. I hope mine works long enough to be enjoyed. Looking forward to new design from George.
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