2. amps-preamps
  3. 148868-82593

How do you know when tubes are done?

I have a homemade pre-amp and amp - both tubed.Recently, it became necessary to turn the volume  up quite a bit to get the same sound level.It still sounds good but I started to wonder if a tube or two was the culprit. The tubes are about 8 or 9 years old and  get light to medium use.
Suggestions?

steamboy
banyanbull
35 posts
 
1947...courtesy of Bell Labs.  1967 courtesy McIntosh Labs when Frank determined his solid state amplifiers sounded better.  ;> )
steamboy OP
8 posts
 
Thanks Pixelreffic,
I will trundle off to my local repair shop.
And get the rest of the amp tested as well.
I am not a tube geek. I know nothing.
steamboy OP
8 posts
 
Here's a photo. 
https://www.psaudio.com/article/do-it-yourself/
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