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Old 14th February 2009, 08:40 AM   #1
rhysh is offline rhysh  United Kingdom
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Default Building first tube power amplifier, reccomendations?

Hi everyone,

Im ready to build my first tube power amplifier. I would like to keep it simple and not too expensive, but a fair amount of output power. (10wpc?). Any recommendadtions of an amplifier that can be buit fairly cheaply (iron).

Rhys
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Old 14th February 2009, 09:15 AM   #2
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EL84 Baby Huey
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Old 14th February 2009, 09:15 AM   #3
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by Audio_idiot
EL84 Baby Huey

Now that is such a coincidence. I was just reading that thread! Thanks!
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Old 14th February 2009, 09:22 AM   #4
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Ha3!

I'm halfway through the re-built this circuit into a bargain chinese EL84 amp, delay by my day job and now stuck with layout in confine space.

A friend built one for a listen and he said and I quote " I found 300b mid-range in this amp".

Now should you stop reading and start collecting parts?

Cheers

Ken
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Old 14th February 2009, 09:23 AM   #5
rhysh is offline rhysh  United Kingdom
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Just what i will do. Any reccomendations for power supply?

R
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Old 14th February 2009, 09:26 AM   #6
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What have you got?
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Old 14th February 2009, 09:27 AM   #7
rhysh is offline rhysh  United Kingdom
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Just a 370HX in the cupboard so far.
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Old 14th February 2009, 09:40 AM   #8
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The secondary is 240-0-240?

if so its very similar with mine.

Mine is 0-230Vac, I used ss diode bridge, then C-L-C (220uf-2H-220uf)

Hope this helps

Cheers
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Old 14th February 2009, 09:43 AM   #9
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nope, 370hx is 275 CT, so you can use choke input, use a small cap before the choke to vary the final voltage.

you can tey PSU2 to come to a good design.

Sorry, not much help here
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Old 14th February 2009, 07:01 PM   #10
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Quote:
Originally posted by rhysh
Just a 370HX in the cupboard so far.

The 370HX is perfect for a stereo baby huey, I built mono baby hueys with the 270EX which is 275-0-275 @ 100ma with a CLC PS. That's exactly half of your 370HX.

The 370 series have a convenient bias tap so you could later modify your BH to the fixed bias variant (or build that first if you have the skills, it's a little more complex)

If you haven't done so already, download PSUDII from duncan amps and model your supply. As mentioned above, you can dial in your B+ voltage (target for BH is around 320+/-) with the first cap when using a CLC
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