26/el-84 amp possible..? - diyAudio
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Old 8th May 2008, 02:46 AM   #1
JandG is offline JandG  United States
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Default 26/el-84 amp possible..?

I would like to try a 26 as a driver in a 2 stage amp & wonder if el-84 strapped would be a possibility..? I have prime examples of both tube type & have built a few 26 pre's with success. Any simple schemetic ideas for this .? Maybe even 26/6v6 strapped in triode. wattage is non issue.. I do have a couple pair of the Tamradio little 5k /8/600 ohm tranny's on hand I could use. Thanks J & G
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Old 8th May 2008, 02:56 AM   #2
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Sure. Take a look at Gary Pimm's web pages for ideas.

http://www.pacifier.com/~gpimm/schematics.htm

Just replace the 45 by an EL84.

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Old 8th May 2008, 03:04 AM   #3
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A look at the data sheet shows that the type 26 exhibits both low mu and low gm.

You can get the gain you need (assuming a CDP source) by CCS loading the tube. Driving the substantial Miller capacitance of a triode wired EL84 or 6V6 could be problematic. DC coupling a ZVN0545A source follower to the anode of the # 26 solves that problem.

If you drive the amp with a line stage that has some gain, you can resistively load the # 26.
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