yea i'd get me a Mullard and an Amperex and some others telefunken

mikE@THECAVE wrote: yea i'd get me a Mullard and an Amperex and some others telefunken

Them-ter Mullards arent cheap$$

1. Is there anything I should look out for as far as replacing the
the tubes

The boogey man..... Elvis Presley ......
No seriously... ,, look out for microphony ..... tap the tube with your fingernail and listen to the sound. Does it ring?
If so , it may be microphonic.
Avoid Sovtek by all means.

2. How many hrs of use on the Seb before they brk in?

4 hours minimum.
10 hours is good for NOS.
20+ hours should settle them in well if they are brand new.

8)

Sebatron wrote:

1. Is there anything I should look out for as far as replacing the
the tubes

The boogey man..... Elvis Presley ......
No seriously... ,, look out for microphony ..... tap the tube with your fingernail and listen to the sound. Does it ring?
If so , it may be microphonic.
Avoid Sovtek by all means.

2. How many hrs of use on the Seb before they brk in?

4 hours minimum.
10 hours is good for NOS.
20+ hours should settle them in well if they are brand new.

8)

If you wouldnt mind,please explain the term "microphony"---is it some source of unwanted tone?

If you wouldnt mind,please explain the term "microphony"---is it some source of unwanted tone?

Well,
sometimes valves ( due to variances in construction) exhibit a tendancy to be sensitive to sounds and vibration.Sometimes it's so bad they can feedback on themselves during high gain demands.
Tapping the valve is one way to check for microphony.
Usually the J.J valves don't have many problems.

8)