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Old 13th June 2017, 11:41 PM   #1
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Default Tony's TABOR amp clone build log.....

starting my own version....operating points of the amp were given,
details of the CCS i can not find, but no biggie there as newer
depletion type mosfets become available, i will use them...
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Old 14th June 2017, 11:27 AM   #2
bondini is offline bondini  Australia
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Thumbs up This will be interesting!

A really interesting design and a shame Gary's Tabor articles are no longer on the internet. I will watch your progress with GREAT interest!!!
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Old 14th June 2017, 02:14 PM   #3
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I'd love to have Gary's work stored. The CCS impedance measurements, the SS amp designs( with the SS 'pentodes' ) and a long list of etc's...
cheers,
Douglas
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Old 14th June 2017, 03:11 PM   #4
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Is this the version that you're working from?

IMG_0028.GIF

CCS schematic is here: https://web.archive.org/web/20101128.../self_bias.htm
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Old 14th June 2017, 10:43 PM   #5
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yes Jerry, and i am mulling separate CCS for each cathodes of the 1624....
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Old 14th June 2017, 10:52 PM   #6
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Quote:
Originally Posted by bondini View Post
A really interesting design and a shame Gary's Tabor articles are no longer on the internet. I will watch your progress with GREAT interest!!!
yes, i was a frequent visitor to his site and read many of his work, time to put them to good use...
what is even more exciting is the arrival of depletion mosfets in the 500volt/6A specs...
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Old 14th June 2017, 10:54 PM   #7
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Quote:
Originally Posted by TonyTecson View Post
yes Jerry, and i am mulling separate CCS for each cathodes of the 1624....
One of the strengths of Gary's design is the single CCS for both cathodes
It needs to stay in pure class A because the current is fixed, so use very efficient loudspeakers.
By using a CCS for each cathode you will have a completely different, and likely worse sounding, amplifier
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Old 14th June 2017, 10:55 PM   #8
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Quote:
Originally Posted by Bandersnatch View Post
I'd love to have Gary's work stored. The CCS impedance measurements, the SS amp designs( with the SS 'pentodes' ) and a long list of etc's...
cheers,
Douglas
many years ago, maybe eight, someone offered this amp to me to build, maybe it was you.....or maybe it was Garry himself......

Bud Purvine was generous enough to give me tips about the input traffo and the output traffo......i am building without the input traffo...
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Old 14th June 2017, 11:00 PM   #9
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Quote:
Originally Posted by pieter t View Post
One of the strengths of Gary's design is the single CCS for both cathodes
It needs to stay in pure class A because the current is fixed, so use very efficient loudspeakers.
By using a CCS for each cathode you will have a completely different, and likely worse sounding, amplifier
well, i have not made up my mind yet...
in my builds, i have had good results with individual biasing of the output power tubes....
i would like to hear more comments before i decide finally...

would an option for paralleling the CCS so i can try it both ways be viable?

when i do an amp, i seldom stick to the theme 100%, i am sure others do it as well....
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Old 14th June 2017, 11:12 PM   #10
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My stock contains some 25 1624's.
When finding time to build a Tabor and trying something different, I would try to replace the CCS in the output stage with a high L common choke (with the right DC resistance for biasing).
That would retain more of the character of this amplifier, and maybe give some more headroom.
Hey you are a winder isn't it?
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