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up-to-date El Cheapo schematic
up-to-date El Cheapo schematic
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Old 13th March 2015, 10:11 PM   #21
Eli Duttman is offline Eli Duttman  United States
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A 6V6 family tube was desired for the "finals". The 12AQ5 was settled on, for its low price. Any 6V6 family tube works with the parts values shown in the schematic.

The B- rail could have been quite a bit "shorter". What was settled on came (you guessed it) from cost considerations. The fact that the B- supply is technically nice is a bonus.

As for "fixed" bias versions of the basic topology, refer to Poindexter's "Musical Machine". Poinz was 1st with this style of 2 stage amp and MUCH was learned from his efforts. The "Musical Machine" is an all out, cost be damned, assault on performance. "El Cheapo" is a budget project that performs far better than the money spent suggests would happen. While inexpensive, the PSU is anything but cheap.
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Old 13th March 2015, 10:41 PM   #22
Jim McShane is offline Jim McShane  United States
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Originally Posted by Jeff Yourison View Post
All the small components are available from Jim McShane, and the trafos and such can be ordered from online electronics vendors.) Jim's page for the El Cheapo is here:

http://pages.prodigy.net/jimmcshane/elcheapo.htm
Actually my page is www.mcshanedesign.net/elcheapo.htm, the old link Jeff posted is dead.
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Old 14th March 2015, 05:21 PM   #23
jdrouin is offline jdrouin  United States
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How many watts per channel does a stock El Cheapo put out (say, with Edcor transformers)?
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Old 14th March 2015, 06:13 PM   #24
vinylkid58 is offline vinylkid58  Canada
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Quote:
Originally Posted by jdrouin View Post
How many watts per channel does a stock El Cheapo put out (say, with Edcor transformers)?
~Ten, AFAIK.

jeff
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Old 14th March 2015, 07:36 PM   #25
Eli Duttman is offline Eli Duttman  United States
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Originally Posted by jdrouin View Post
How many watts per channel does a stock El Cheapo put out (say, with Edcor transformers)?
Approx. 6 WPC for triode and 12 WPC for UL. Some variation will occur depending on B+ rail voltage and selected O/P "iron".

Dynaclone Z565s are the "Gold Standard" for O/P trafos, in an "El Cheapo". Edcor's CXPP25-MS-8K is certainly hefty enough for UL mode. Stick strictly to triode mode, when low cost guitar amp "iron" is used.
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Old 14th March 2015, 08:00 PM   #26
planet10 is online now planet10  Canada
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up-to-date El Cheapo schematic
Our variation on El Cheapo uses triode wired EL84 and runs in Class A. 3.2W at clipping and a fantastic sounding amp.

Eli, i'll be happy to update the drawing but i can't do it until i resolve some issues with my CAD software.

dave
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Old 14th March 2015, 08:46 PM   #27
Eli Duttman is offline Eli Duttman  United States
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Dave,

If another Scott "donor" ends up on your doorstep, try 6CM6s as the "finals". The 6CM6 is a Noval based member of the 6V6 family.
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Old 14th March 2015, 08:55 PM   #28
tomlang is offline tomlang  United States
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Is there any "simplification" that can be done to this? I.e. utilize a LM334 and skip the negative supply for the LTP as I show in post #20?
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Old 14th March 2015, 09:12 PM   #29
Eli Duttman is offline Eli Duttman  United States
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AFAIK, it will NOT work, without the B- rail.
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Old 31st October 2017, 08:08 PM   #30
crazyfrog is offline crazyfrog  Canada
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up-to-date El Cheapo schematic
Default Sorry...

I didn't want to bring back to life an old thread but I had to ask: did someone build an El Cheapo "on steroids" ? With EL84m or 6P14P-ev , higher voltage, fixed bias and MOSFET buffer (ZVN0545A, FQPF2N80...) between LTP and OT ?
If this is the case, is the schematic very different from post 20?
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