PRS MT-15 v1 amp + PRS 1x12 MT cab

[AlbertA]

I got the PRS MT-15 v1 about a month ago ($for 400) and I've been looking for a speaker cabinet to go with it.
This past week a PRS MT cab popped up for $190 so I snatched it up. It's a 1x12 with a Celestion V30 16Ω.

And wow this amp was made for a V30 - when I tried my Archon Stealth cab (Celestion v-type) the amp was too "spitty".

It gets loud real soon though - I can barely touch that master - The V2 seems better in this respect so I will look into modifying that.
It has a half-power switch that does drop volume but I don't like what it did to the tone - Full power for me.

Here's a short demo with a Ibanez JS1200:

 

[AlbertA]

The PRS MT 1x12 Cab





Here's the impedance curve I measured, nice peak at 100Hz.

 

[AlbertA]

PRS MT-15 Amp gut shots


JJ 5881 Power tubes
The amp was biased at 24mA, a little too cold for me - I increased it to 29mA.
The amp runs the plate voltage at ~425V.



Looks like an soldering iron burn - I guess someone's been around here.


And this is probably why I didn't like what the half-power switch did to the tone - I believe it switches this resistor together with the connected speaker load.

 

[AlbertA]

Loop Noise

Yeah it's a bit noisy - probably the first thing I will address.

• 00:00 - Amp off - just a background noise to give you a reference
• 00:11 - Amp on - standby on
• 00:37 - Standby off - amp is now fully on, nothing on the loop
• 00:53 - Connecting to an Axe-Fx 3 using a humbuster cable for the return.