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Old 7th September 2005, 08:30 PM   #1
gary f is offline gary f  Canada
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Default Searching for simple circuit

I'm looking to build my first tube amp. I've done a few kits and now want to build a simple and not too expensive amplifier.

I'm looking for a integrated amp with simple circuit. I'm not looking for power particularly but some triode circuits are a little low on power (2-4 watts is not very much). 10 watts would be great.

Do you guys have any suggestions of a simple circuit, that would not cost too much to build. I would like to spend maybe less than 400$ on that first one.

Thanks
F
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Old 8th September 2005, 02:19 AM   #2
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A single ended 6550 can do 10 Watts, but push-pull 6BQ5s can do 15 Watts for less... you might look at the Dyna 35 clone at http://www.diytube.com
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Old 8th September 2005, 12:43 PM   #3
gary f is offline gary f  Canada
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Thanks

About sound quality, do you have a preference between the two you suggested.
F
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Old 9th September 2005, 12:56 AM   #4
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I haven't heard either, but I have a diytube amp in the works... I haven't spent much time in the shop this summer, but will be back at it soon.

A set of transformers for the diytube amp is $170 at Triode Electronics. Transformers for a SE 6550 amp would be about $280.
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Old 9th September 2005, 04:09 AM   #5
kmtang is offline kmtang  Canada
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I would say a 2A3 3.5W or 300B 8W Single-Ended Power Amplifier is very simple to build. Regarding the price, it really depend on what kind of trannys you want to put in. The Hammond transformers are very nice with reasonable pricing. I don't see there are very significant price difference in 2A3 to a 6550 SE amp.


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Old 9th September 2005, 05:43 PM   #6
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300B's are expensive to buy, and represent a significant ongoing expense.
Consider the RH807 (do a search) which has an extremely good cost to performance ratio, and 807's are availble at a fraction of the cost of DHT's.

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Old 10th September 2005, 08:43 AM   #7
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If I were you I'd build a push-pull design using an inexpensive, readily available pentode such as the EL34 in triode mode. You should be able to get at least 15w with 400v B+, you won't need much negative feedback (if any) to get a decent damping factor and the required output tansformer need not be too expensive. There are lots of circuits around for this type of amp.
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Old 10th September 2005, 08:05 PM   #8
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Gary,

Poindexter's PP triode wired PP 6V6 "integrated" amp is good for 8 WPC. There's all sorts of things that can be done to tweak Poinz's ELEGANT design. Switching to ultralinear/exolinear should get about 12 WPC. Uncle Ned's "Dynaclone" trafos would be FINE. EL84s instead of 6V6s are FINE too. The $400 target seems quite reasonable to me.

FWIW, I'm involved in scoping out a Bargain Basement project that uses $20 guitar amp O/P "iron". My thinking is to LOOSELY follow Poinz's lead at a MUCH less elegant level. Perhaps you might pick up a useful tidbit or 2, as the cheapskate project evolves.



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Old 12th September 2005, 03:00 PM   #9
gary f is offline gary f  Canada
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Thanks for all the info. Poindexter site is interresting. The EL34 in triode mode is also a good idea since I have a few El34 laying around. I will check that out also.

Thanks
F
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