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Old 10th June 2004, 02:14 PM   #1
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Default simple, single-ended project

i am hoping over the course of this summer to try my hand at some diy tube designs, and was hoping for any recommendations on a good schematic.

i'd rather do it all myself than buy a kit, i'd much prefer a single-ended design as i run very efficient speakers; and due to economy and personal beliefs on such matters i'd prefer the lowest part count in the cirucuit as possible.

and as this will be my first foray into valve diy, the less expensive the better.

any suggestions would be much appreciated, thanks in advance.

jesse
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Old 10th June 2004, 02:33 PM   #2
Fuling is online now Fuling  Sweden
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Two ECL82/6BM8s, two Hammond 125ESE, a suitable power transformer and choke and a bunch of caps & resistor.
Put it on a piece of sheet metal with a wooden frame and youre done!

Ive built two such amps, one with extremly small OPTs and one with slightly bigger ones (both types are much smaller than 125ESEs) and I can highly recommend it as a first time project.
Low voltages (just above 200V), cheap and easy-to-find parts,
very simple design and very good sound!!

A perfect amp if you want to experimet with triode/pentode connection and different feedback ratios.
I run mine as triodes and it sounds fine, a bit too fine when I compare to my 6B4G SET and consider the price difference...
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Old 10th June 2004, 03:21 PM   #3
G is offline G  United States
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This should start you on your way to audio Nirvana.

http://www.lh-electric.4t.com/projects/tiny3w.htm
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Old 10th June 2004, 05:56 PM   #4
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Quote:
Originally posted by G
This should start you on your way to audio Nirvana.

http://www.lh-electric.4t.com/projects/tiny3w.htm
Thanks Gavin,

Just looking at the website, and knowing nothing about the quality of the design or parts, that looks like a very nice way to get one's feet wet-- cheap, bundled parts, detailed instructions.

best,

George Ferguson
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Old 10th June 2004, 11:35 PM   #5
G is offline G  United States
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Quote:
Originally posted by DrDeville


Thanks Gavin,

Just looking at the website, and knowing nothing about the quality of the design or parts, that looks like a very nice way to get one's feet wet-- cheap, bundled parts, detailed instructions.

best,

George Ferguson

No problem. I might order one of the kits myself.
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Old 11th June 2004, 02:32 PM   #6
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Fuling,

sounds simple enough, however- as i'm not used to working with valves at all- i really rather need (or at least would feel much more comfortable/confident with) an actual schematic for something like that. glad to have the exact # for the transformer though. if there's any way you could post or email me a circuit diagram for that it would be fantastic. thanks.

jesse
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Old 11th June 2004, 03:14 PM   #7
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Hi,

If you want to stick with the ECL82/6BM8, here are a few circuit diagrams for you to look at:

SEMPER BONAVOLTA

Cheers,
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Old 11th June 2004, 08:30 PM   #8
Fuling is online now Fuling  Sweden
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There are plenty of 6BM8 schematics online, some "googling" should provide you with everything you want here.
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Old 14th June 2004, 01:23 PM   #9
jueic is offline jueic  Taiwan
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Default Re: simple, single-ended project

Quote:
Originally posted by jesserparker
due to economy and personal beliefs on such matters i'd prefer the lowest part count in the cirucuit as possible.

You may find this article very helpful.

Calculating DC coupled Single Ended Valve Amplifiers - Part #1


I did follow it and constructed a SE amp using 6au6 & el84...and very happy with the sound(especially good bass), actually I am listening to it now. .

It doesn't show power supply portion, I used chip LM317T to have both HT and heater regulated, the amp is super quite.




.
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Old 16th June 2004, 01:30 AM   #10
karma is offline karma  Canada
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well it's a headphone amp but its a good start
this one im starting

http://www.headwize.com/projects/ciuff4_prj.htm
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