Philips MKT capacitors?

[Dingleberry]

Hi!
Marshall-fever hit me big time a while ago and I see no other cure for it than build me one.
I have plenty of these 22nf Philips MKT caps and I was thinking about using them
It’s gonna be late JMP 2204/early JCM800 —type circuit and what I’ve read that those yellow box caps were MKT-type and made by Philips and chicklets were MKT too. So probably sound wise they will suit well also?
Only thing that bothers me is that they look a bit wimpy
They kind of look that they won’t handle 400V and when playing with serious volume that marshall will spit fire trough them...
Were those yellow box caps 400V or 630V?
Has anyone used similar caps?

[martin manning]

Metallized polyester film should be fine from a sound perspective. Re the voltage rating, consider the B+ you will be running. if it's ca. 400V like a JMP or early JCM800, I'd say the 400V rating should be enough. In photos I've seen 400V Phillips Mustard caps in JMP amps.

[Dingleberry]

The B+ will be in the 400V ballpark. So in the preamp plates and CF stage cathode there will be maximum like 250-300V. I think I try and see how it sounds and what happens.

[Blindog]

I used that series to upgrade the stock caps in my Vox AC302X.
perfect size for the pc board, and better yet they sound fantastic!

[frankdrebin]

Hi!
Marshall-fever hit me big time a while ago and I see no other cure for it than build me one.
I have plenty of these 22nf Philips MKT caps and I was thinking about using them
It’s gonna be late JMP 2204/early JCM800 —type circuit and what I’ve read that those yellow box caps were MKT-type and made by Philips and chicklets were MKT too. So probably sound wise they will suit well also?
Only thing that bothers me is that they look a bit wimpy
They kind of look that they won’t handle 400V and when playing with serious volume that marshall will spit fire trough them...
Were those yellow box caps 400V or 630V?
Has anyone used similar caps?

i used them,i also had a couple amps that had them by factory,changed them all with Wimas,no sound change.

[hitchcaster]

electroplex uses them in some of his amps.. they sound alright.. im sure theres no issue with "can't take it" as long as its 400v ... id use something else myself though.

[Dingleberry]

Thanks for the replies! I think I’ll use them for most parts of the signal chain.
I was going trough my stashes last weekend and selected most of the components to make a layout.
Found two of those ”no-name” 22nf/1kV KT-capacitors so those will go after P.I.
ERO mkt1813 680nf caps I have for cathode bypass.
Found a couple of mustards too and with pf-values I think I’ll go with styroflex caps all the way because I have them on hand and I’ve used them in other builds with good succes.
Got also some nice NOS Beyschlag and Philips resistors that will end up on this build.
Can’t wait to start this project

[Dingleberry]

And I have a head cab waiting also.
This was some old telephone equipment box but it just looks that there has to be an amp in it!

[Dingleberry]

Turret board and turrets finally came and components are fitting nicely.

[ChopSauce]

Nice sight...