I Want to Build a Slave Amp

Cadorman

Cadorman

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I'll probably regret posting this down the road, but here we go. I'm thinking about building a stripped down amp to run as a slave unit off of the loop in my DSL. I'm currently using my 50 watt jcm900 taking the second out on a mxr 10 band into the loop return. This seems like a waste of the amp and only the master volumes and presence work in this configuration.

I want to take a 2204 circuit and eliminate everything before the loop. So, on the front I would have power, standby, volume, presence and maybe a resonance control. The back would have a pair of speaker jacks, voltage selector, impedance selector, loop return and a loop send if I can for additional units.
20210710_175744.jpg
Here's the diagram I'm looking at.

My question is can I just eliminate everything on the board before the dual can cap and change that to a single 50? Also eliminating v1, v2, all tone controls, gain and input jacks. Having a half power switch would be cool. I would eliminate the bias test points as well as I have one of the VHT meters and that has dual test points if I want to check it against my DVOM.

Thoughts? I think it would be fun.
 
Cadorman said:
I'll probably regret posting this down the road, but here we go. I'm thinking about building a stripped down amp to run as a slave unit off of the loop in my DSL. I'm currently using my 50 watt jcm900 taking the second out on a mxr 10 band into the loop return. This seems like a waste of the amp and only the master volumes and presence work in this configuration.

I want to take a 2204 circuit and eliminate everything before the loop. So, on the front I would have power, standby, volume, presence and maybe a resonance control. The back would have a pair of speaker jacks, voltage selector, impedance selector, loop return and a loop send if I can for additional units.
View attachment 70539
Here's the diagram I'm looking at.

My question is can I just eliminate everything on the board before the dual can cap and change that to a single 50? Also eliminating v1, v2, all tone controls, gain and input jacks. Having a half power switch would be cool. I would eliminate the bias test points as well as I have one of the VHT meters and that has dual test points if I want to check it against my DVOM.

Thoughts? I think it would be fun.
Click to expand...

can I just eliminate everything on the board before the dual can cap and change that to a single 50?

No
You still need the dual can cap.
1/2 is for screen grid filtering.
1/2 is for PI filtering.
You still need a PI tube in a slave amp.

Also eliminating v1, v2, all tone controls, gain and input jacks.

Yes

Having a half power switch would be cool.

OK you can switch it triode /pentode using a DPDT ON-ON switch. But use a Carlon switch which is heavy duty and rated high as possible...
They do make a 600V rated toggle switch. Which is what I would prefer.
(Toggle switches are really only made for AC, but we use it for small current DC)
But only switch it when the standby is set warm up (not operate).
This will save the switch contacts from toasting when changing from Hi to low power..

I would eliminate the bias test points as well as I have one of the VHT meters and that has dual test points if I want to check it against my DVOM.

OK fine
 
Amp Mad Scientist said:
can I just eliminate everything on the board before the dual can cap and change that to a single 50?

No
You still need the dual can cap.
1/2 is for screen grid filtering.
1/2 is for PI filtering.
You still need a PI tube in a slave amp.

Also eliminating v1, v2, all tone controls, gain and input jacks.

Yes

Having a half power switch would be cool.

OK you can switch it triode /pentode using a DPDT ON-ON switch. But use a Carlon switch which is heavy duty and rated high as possible...
They do make a 600V rated toggle switch. Which is what I would prefer.
(Toggle switches are really only made for AC, but we use it for small current DC)
But only switch it when the standby is set warm up (not operate).
This will save the switch contacts from toasting when changing from Hi to low power..

I would eliminate the bias test points as well as I have one of the VHT meters and that has dual test points if I want to check it against my DVOM.

OK fine
Click to expand...
BAM - and there it is! Way to break it down AMS!
 
Amp Mad Scientist said:
can I just eliminate everything on the board before the dual can cap and change that to a single 50?

No
You still need the dual can cap.
1/2 is for screen grid filtering.
1/2 is for PI filtering.
You still need a PI tube in a slave amp.

Also eliminating v1, v2, all tone controls, gain and input jacks.

Yes

Having a half power switch would be cool.

OK you can switch it triode /pentode using a DPDT ON-ON switch. But use a Carlon switch which is heavy duty and rated high as possible...
They do make a 600V rated toggle switch. Which is what I would prefer.
(Toggle switches are really only made for AC, but we use it for small current DC)
But only switch it when the standby is set warm up (not operate).
This will save the switch contacts from toasting when changing from Hi to low power..

I would eliminate the bias test points as well as I have one of the VHT meters and that has dual test points if I want to check it against my DVOM.

OK fine
Click to expand...
Perfect. I forgot about the 10k 2 watt resistor tying the two sides of the can cap together.
 
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