Valve mic-pre amp blown !! advice needed !

[MartyMart]

I had a nice "Mindprint MKI" rack mic pre.
It's now just the "pre amp" section that's working !
The eq/valve comp/saturation block is dead.
Inside, there's "blown" evidence around the following:

1 - 15 ohm 2 watt power resistor ( which still reads 15 ohm's removed )
2 - pair of 22 ohm 1/2 watt r's between transformer and caps to valve section ( read 22 ohms removed )
3 - 1N4007 across those same 22 ohm r's ( reads .68v drop removed )

I removed/cleaned up and resoldered all these, put a new 1N4007 in.
Still dead !  ( solder pads are looking very "flakie" and damaged )
Wondering if these should be replaced anyway, or if the two large caps ( 2,200uf 16v ) following
the blown items towards the valve section should be replaced ?
Can't be the whole transformer blown, as it "works" as a pre-amp only, including the 48v
phantom power too !
All front panel LED's /compression ladder etc all working,
12AX7 lights up also .....( new one in as well )

Any thoughts from those more used to these kind of circuits/voltage ?

Many thanks,
Marty.

[Johan]

do you have any voltages, beside the heater on the tube?..
..I know when I was working with repairing dbx xtuff, the anode resistors in the 500-series ( 586,566..) blew every now and then and everything went silent...

johan

[MartyMart]

Thanks, I'll take some readings and come back .....

MM.

[MartyMart]

12AX7 voltages :

Pins :
1 1.91v
2 1.94v
3 1.58v
4 13.82v
5 0.00
6 0.00
7 1.14
8 0.00
9 0.94

MM

[A.S.P.]

looks like half of the tube doesn`t get heated,
and 1 triode doesn`t get plate voltage

[Johan]

12AX7 voltages :

Pins :
1 1.91v
2 1.94v
3 1.58v
4 13.82v
5 0.00
6 0.00
7 1.14
8 0.00
9 0.94

MM

..now this doesnt look right..if you are feeding the heaters at pin 4 with pin5 at ground, you should have half that voltage at pin 9.  also, from the voltages above, it looks like only one side of the tube is used (pin 1-3 + heater ) and you have almost no voltage at the anode (pin1 )...so I would look for any resistor going to that pin, pull it from the board and mesure it..my guess is it's open...

johan