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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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Quote:
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...

hareynolds,

Any updates from this experiment?

Cotdt,

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, 52 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
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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
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