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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 30th December 2012, 07:58 AM   #21
cotdt is offline cotdt  United States
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I'm using Hashimoto's, but I don't have Edcors to compare. Tight on cash these days.
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Old 30th December 2012, 08:58 PM   #22
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After paying for the Hashimotos, one just might be a wee bit low on cash...
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Old 4th January 2013, 06:27 AM   #23
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If playing with 6AV5/6FW5, make sure to have fuses installed in series with HT end of O/P transformer primary - as per advice given by George and others, might save a bit of pain if the O/P tube "takes off" into runaway - we are being a bit negotiable with screen grid rating in triode mode
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Old 7th January 2014, 10:37 PM   #24
zman01 is offline zman01  Bangladesh
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Originally Posted by hareynolds View Post
In order to test the role of the cheapie Edcors, I ordered
(a) a pair of GXSE 15-8-5K OPTs ($38 each) and
(b) a pair of CXSE 25-8-5K OPTs ($84 each)
Bringing this thread back to life after a year...


Any updates from this experiment?


Did you try out the 6AV5 with the Hashimotos and if yes, how did they sound?
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Old 24th January 2014, 10:46 AM   #25
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I would love to find a terrific 6AV5GA schematic...does this compare favorably to 6BC5A or 300B? I do not mind using more iron if she will get me there.
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Old 24th January 2014, 08:56 PM   #26
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Attached is a somewhat ratty looking schematic that might be of use.
There is no magic in it, I used Tubelab's Power Drive cct with a triode strapped 6AG5/6BC5 (and LED bias), and a random power MOSFET 2SK2717 as source follower. The output transformer is a One Electron UBT-3.
Since I drew that one, I replaced the load resistor for the MOSFET with another IXCP10M45 CCS, set to 10mA, and increased the supplies for the MOSFET to +&- 150 volts.
With damper rectified power supply delivering ~330 volts to output stage, power is 6-7 watts with 6AV5 biased for 60mA. The UBT-3 has excellent bandwidth in this circuit, AFAIR the -3dB points at 1 watt were 15Hz and 45k respectively.
Lively sounding unit for a SE, visitors have preferred it to my other projects, plays well on Klipsch Heresys.
I can't compare it to a 300B since I don't have any, but I'd comment that my intent when putting it together was to make a SE with bandwidth and little "sound" of it's own.
Attached Files
File Type: pdf SE_schema_20120801_0001.pdf (90.2 KB, 153 views)
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Old 11th May 2014, 01:59 AM   #27
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Some of my experiences and experiments with 6AV5GAs can be found through this link:

diytube.com • View topic - New Year's 6AV5GA SET project

Also 12AV5GAs: diytube.com • View topic - 12AV5GA SE amp build
real radios glow in the dark
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Old 11th May 2014, 02:19 AM   #28
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The "Genesis" of my 6AV5GAs SE amplifier experimentation started here:

diytube.com • View topic - get*set*go 6AV5GA build
real radios glow in the dark
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Old 7th July 2015, 05:58 PM   #29
MikeV is offline MikeV  United States
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Default oddball tubes in the SSE

Howdy Guys!

Long idle thread brought back...
Is the O/P still around? Paging hareynolds... hope you're well and continuing your adventures with the 6AV5
Great stuff in the early posts of this thread, have any of you modded your SSE's with "alternative" tubes? Not just the easy drop ins, but some that require similar creativity with the wiring...

Ed in NC, I really like your work, I've followed your stuff over on diytube.com! Have you done any more work with the 6GE5? Like hareynolds found with the 6AV5 it might have promise in the SSE

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