Mark 2C+ Voltage Gain in each stage

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Wildman
Bottle Rocket
Posts: 7
Joined: Sun Mar 15, 2020 3:47 am
Location: Qld. Australia

Mark 2C+ Voltage Gain in each stage

Post by Wildman » Sun Jan 10, 2021 10:09 pm

Help with info for a Mark 2C+
I am doing some work on a copy of a Mark 2C+ and need some information, to check what is working correctly and what is not.

Has anyone measured the Level of Signal Voltage Gain for each of the stages and the Level of Attenuation between stages?
Is there any Waveform info available?
Is there a Voltage Chart available?

All info appreciated.
Noel

woodbutcher65
Mark III
Posts: 305
Joined: Fri May 04, 2018 10:36 pm

Re: Mark 2C+ Voltage Gain in each stage

Post by woodbutcher65 » Mon Jan 11, 2021 7:48 pm

Got an RCA tube manual?

Got the Mark IIC+ schematics?

Using the data in the schematics, and the study guides in the back of the RCA tube manual, you can determine the voltage gain of the stages.

Wildman
Bottle Rocket
Posts: 7
Joined: Sun Mar 15, 2020 3:47 am
Location: Qld. Australia

Re: Mark 2C+ Voltage Gain in each stage

Post by Wildman » Mon Jan 11, 2021 11:20 pm

woodbutcher65,

Yes I have all of that info and I have already calculated the stage gains.
I am interested in real life measurements, to see how they compare to the theoretical figures and how the waveforms look at each stage.

woodbutcher65
Mark III
Posts: 305
Joined: Fri May 04, 2018 10:36 pm

Re: Mark 2C+ Voltage Gain in each stage

Post by woodbutcher65 » Tue Jan 12, 2021 2:49 am

An oscilloscope and probes will quickly give you the answers you seek. Since I lack a Mark IIC+ at the present time, I only have half the solution. (The scope.)

Wildman
Bottle Rocket
Posts: 7
Joined: Sun Mar 15, 2020 3:47 am
Location: Qld. Australia

Re: Mark 2C+ Voltage Gain in each stage

Post by Wildman » Tue Jan 12, 2021 8:36 pm

I have a scope.
I want to compare what I see on this amp, with what is normal on a Boogie.
This is why I wanted to see waveforms and voltages from a genuine Mark 2C+.
Finding anyone with access to a C+ in Australia is rather unlikely, so very difficult for me to compare.

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