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    Building, troubleshooting and testing of these amplifiers should only be
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Air Tight M101 schematic?

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#21
Originally I was looking to build something like the AirTight amp. I know the transformers wont be the same etc. I will look at the pictures and trace the schematic myself.

Nope not taking the quiz. I have nothing to prove. Yes most of the resistors i use for my amps and stuff don't have color codes and have the values printed on.

Thanks to those that did help me.

I will not be responding anymore to this thread.
 
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#25
huggygood said:
I think the right question is “why?”
1- for the purpose of repair?
2- with the aim of creating a “perfect” clone?
hooman said:
NO....... 12ax7 in parallel.
Click to expand...

3- with the aim of cloning the schematic without the specific information of the PT and OPTs?
Click to expand...

AudioGeek said:
Just wondering if there is a schematic of the Air Tight M101 floating around? I found some nice interior pics and could reverse engineer it if i had too.

Is it just a 12AX7 SRPP into a KT88 UL with some global feedback?

Thanks!!

Richard
Click to expand...
Brown Black Red Gold 1K 12AX7 x 2 SRPP very simple circuit and a 600 ohm cathode R on the KT88 and current is set , go look at the KT88 datasheet for Ultra Linear and from there you can determine the input voltage and operating point , ohms law will do the rest
 

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  • 1K x2 .png
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#26
Hi, On closer inspection on another image I found the 12AX7 has parallel plates and cathodes / grids with a 100K Plate's resistor and probably a 1.2K cathode's resistor .
The B+276V and 146v on the parallel 12AX7 plates strapped together @ 1.3mA .
12AX7 current .png
 
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