Bogen K10 Master Volume

[Ifudontlikebees]

Hey everyone, nice to meet you all! This is my first post on this forum and I’m new to modding/building tube amps so bear with me. I picked up a bogen k10 for a guitar amp conversion and wanted to add a master volume. I was going to use rob robinettes pre phase inverter master volume but was unsure on what kind of PI the K10 had. From my basic and inexperienced understanding I believe it’s a cathodyne PI but I don’t want to add the master volume until I’m sure of it. Could anyone please look this schematic over and let me know? Thanks! Sorry for the newbie questions hahaha

[sluckey]

It's NOT a cathodyne. It's a paraphase inverter.

[Ifudontlikebees]

Thank you for clearing that up! What would be the best place to add a master volume then? Also if possible could u explain why it’s a paraphrase inverter and not a cathodyne?

[thetragichero]

compare: http://www.valvewizard.co.uk/cathodyne.html
http://www.valvewizard.co.uk/paraphase.html

[sluckey]

There is no good place to put a MV in that circuit.

[PRR]

L-pad on the output.

As implied, Bogen already made the most of a low-low parts budget, there's little to "mod" that makes sense.

[Ifudontlikebees]

Thanks for those links! That helps a lot. If possible I would really like to add a master volume. What I’ve done so far is added a 1/4 input jack in place of the phono jack and routed it directed to the .033uf cap before the 6au6. I left the mic input there hoping I can also use the amp as a mic pre too. What is the L-pad on the output?