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Old 24th November 2008, 02:03 AM   #1
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Default power transformer recommendation

Hello, I am in the process of sourcing parts for the "simple SE" on tubelab.com as I'm sure many of you are familiar with the site. I was wondering about the power transformer options out there. Just looking for a basic one, nothing fancy. According to Digikey they only have power transformers up to 250~ VAC, and from what I understand I need approximately 450-500 volts?

Thanks guys, its not my first electronics project, but my first tube amp.
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Old 24th November 2008, 02:10 AM   #2
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You didn't ask, but stick with the vacuum tube rectifier. Forget about the solid state FRED rectifier diodes.

Go with an Allied 6K7VG from www.alliedelec.com (far less expensive) or try a Hammond 374BX from www.tubesandmore.com ($$$, but possibly a higher quality transformer).
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Old 24th November 2008, 02:16 AM   #3
chrish is offline chrish  Australia
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I am pretty sure that this transformer is mentioned on the tubelab site as suitable:

Allied 6K7VG
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Old 24th November 2008, 03:28 AM   #4
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Other options:

Angela Universal power transformer
120V/240V primary! 380-320-55 (bias tap) -0-320-380 at 200mA. 6.3VCT at 3.5A for power and input tube filaments! 5V at 3A for rectifier tubes. 5VCT at 1.5A for 300B filament.

Edcor XPWR110
Tube Amplifier Power Transformer, 120V, 60Hz to 800V CT & 6.3V
Edcor can custom build to your requirements.

Lots of options from surplussales
http://www.surplussales.com/transformers/HvLvTr-7.html

Many options at VT4C
http://www.vt4c.com/shop/program/main.php?group_id=7
and the have R-core power transformers
http://www.vt4c.com/shop/program/mai..._id=7&hit_cat=
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Old 24th November 2008, 04:19 AM   #5
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thx TY_Bower, I was going to go with the vacuum tube rectifier, the FRED I just ordered incase I couldn't get tubes. they were only a dollar a piece.
You mentioned the allied transformer, specd:

TRANSFORMER, PRI:110-120V, 50/60HZ, 750VCT @150DCMA, 5V @3A, 6.3A @ 5.0A, LEADS

I take this to mean input of 110-120V, output at 750V @ 150 milliamps in DC voltage? I'm not sure what the rest of that means though. I thought the simple SE ran on approximately 450-500 volts?

Sorry about the amount of questions.

Thanks again.
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Old 24th November 2008, 07:52 AM   #6
chrish is offline chrish  Australia
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the 750 volts is actually 375-0-375. You will have a full wave rectifier, which is two diodes, one rectifying each winding with the centre tap going to ground. So, to work out your DC voltage, multiply 375 x 1.414 = 530 volts. You will get some voltage drop through the rectifier, so will probably get about 480-500 volts.

This transformer is what tubelab uses and he recommends. I use the hammond 300 series as I need the multiple input taps because we have 240 volts here in Australia. There quite a few threads on Simple SE builds here, take a look if you are building one. This is a great amp, love mine!

Cheers,

Chris
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Old 24th November 2008, 08:13 PM   #7
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hows the handmade h841
http://www.hndme.com/productcart/pc/...idproduct=1382
it'd help me save on shipping costs (30+$)
would the 300 - 300 be too low for usage?

thanks
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Old 24th November 2008, 09:26 PM   #8
chrish is offline chrish  Australia
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Have you seen this page on the tubelab site? http://www.tubelab.com/AssemblyManua...ormers_SSE.htm

It lists the voltages and tubes and output transformers. The page looks blank when you get to it, you have to scroll down.

To answer your question, yes that transformer is usable. However, you will only get half the output power from your amp, and it costs about $30 more, than the recommended transformer.

Hammond 274BX or Allied 6K7VG.
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Old 24th November 2008, 10:38 PM   #9
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Yes, I've read that page, unfortunately most of its just mumbo-jumbo.
and its all about tubes, i dont see any power transformers?

thanks for the info tho.
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Old 24th November 2008, 10:44 PM   #10
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by nukaidee
Yes, I've read that page, unfortunately most of its just mumbo-jumbo.
and its all about tubes, i dont see any power transformers?

thanks for the info tho.
Neither do I, and the page does not display properly in Firefox either. Not mumbo-jumbo at all, just a table of expected output powers by tube type and specific operating conditions.

The Allied 6K7VG or 274BX series Hammond are solid recommendations however.. I would go with one of these two..
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