Finished a rebuild on my preamp...

[Fast996]

Tube type in which i replaced the carbon comp resistors with MR-MF Xicon resistors .They have 300 hours on them and the preamp is noticeably noisier with a hotness to the sound of vocals & highs.Although the preamp was mfg in 1956 and all the components were showing there age as a few caps the 4uf coupling caps were leakers. I decided to change the the resistors out with mostly the same wattage spec.
Now there is a hotness and a haze to the floor in the amp.Are Xicon known for this as I am not happy.I have read that these are magnetic and that is part of the problem.
Any info and observations towards Xicon's metal film types would be helpful.

[indianajo]

In my 1961 PAS2 tube preamp, I last winter changed the plate resistors and some other resistors over 47k from carbon comp to metal film sourced from multicomp, house brand of newark.com, and vishay also from newark. Probably both brands are from the same factory in India. I used 2 & 3 watt resistors instead of 1/4 watt because they were rated for 450 VDC or more. The only thing I noticed was that the hiss was reduced, which is good.
When I changed the paper caps, mostly 0.2 uf, to 0.22 uf polyester caps, it got a lot brighter, has too much treble. Rather than changing again I am running with the treble tone control down a bit . The too much treble is versus both the same box the day before, and a disco mixer I worked over to make it sound roughly like the PAS2. The disco mixer has no tone controls, so I'm glad I like its sound after all that work.
I did the changes 2 parts at a time and checked my work audibly in between, so I know which component did what.