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I want to build a Small Class A tube amp . [message #26935]

Fri, 10 December 2004 15:39

JMONEY
Messages: 3
Registered: May 2009

Esquire

I want to build a small Class A tube amp. For studio work. I have a Fender Champ size enclosuer for it. As far a controls go. I just want a Volume Bass MID & treble controls. I want a Clean "hi fi " sound. Plenty of headroom.

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Re: I want to build a Small Class A tube amp . [message #26936 is a reply to message #26935]

Sat, 11 December 2004 18:38

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

How much power do you want? Have you checked into any of the kits? Seems like I saw some schematics in the posts here as well, so you could probably roll your own that way as well. But what kind of power are you expecting?

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Re: I want to build a Small Class A tube amp . [message #26937 is a reply to message #26936]

Sat, 11 December 2004 20:10

JMONEY
Messages: 3
Registered: May 2009

Esquire

I want something from 5-10 watts. I think the kits I have seen are too pricey. I prefer more choices when it comes to parts,ect.Thanks for the reply!

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Re: I want to build a Small Class A tube amp . [message #26938 is a reply to message #26937]

Sun, 12 December 2004 00:40

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

I guess the 2A3's max out about 3 watts when used Class A. If that's enough, you can build an amplifer pretty cheaply.

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Re: I want to build a Small Class A tube amp . [message #26939 is a reply to message #26938]

Sun, 12 December 2004 00:43

JMONEY
Messages: 3
Registered: May 2009

Esquire

Where can I find the schem ?

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Re: I want to build a Small Class A tube amp . [message #26940 is a reply to message #26939]

Sun, 12 December 2004 06:59

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

Here are a few:

Homebrew amp schematics

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Re: I want to build a Small Class A tube amp . [message #26951 is a reply to message #26940]

Sat, 18 December 2004 07:14

Thermionic
Messages: 208
Registered: May 2009

Master

Check out Angela Instruments' website for their Super Single Ended guitar amp project. It's essentially a blackface Fender, which of course will give you a tremendous clean sound.

Thermionic

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Re: I want to build a Small Class A tube amp . [message #26952 is a reply to message #26951]

Sun, 19 December 2004 02:27

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

Cool, thanks!

I'm still itching to see some of your designs!

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Re: I want to build a Small Class A tube amp . [message #26956 is a reply to message #26952]

Mon, 20 December 2004 22:24

Thermionic
Messages: 208
Registered: May 2009

Master

Say Wayne, I'll post a pic of a hi-fi amp I'm working on for a customer when it's finished. Just a cheesy little cheapo beater EL84 PP amp for a second bedroom system, nothing special.

I'll be building some of "the good stuff" after that, including a copy of my EL34 PP design. It uses a battery biased 6C45 per channel, choke-loaded parafeed through a silver foil/paper in oil cap into a mu-metal phase inverter transformer. The cathode biased PP pair of EL34s are switchable between triode and ultralinear, feeding the speaks through a Plitron toroidal OPT.

The HEXFRED rectified main power supply is a stiff, choke input monster with very low impedance. The preamp tubes have a separate tube rctified supply with motor run oil caps. I also use separate filament trannies. It's a real killer diller, and a real backbreaker at nearly 60 pounds too! Maybe I'll show up at one of the shindigs in Tulsa with one someday!

Thermionic

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