CV2493 in an old Tek h
Posted: Sun Sep 16, 2012 2:13 am
hello friends,
I am restoring an old Tek 585A scope.
The tubes in the distributed amplifier section are "collected" from the pre owner, "to make it working". So there is a colored mix of ECC88, E88CC, 6DJ8, PCC88 (this is a 7v TV... ), some are good, some are tired, some are short before the end...
So I am planig to plug the complete stage with new old stock tubes, "CV2493" made by mullard, uk. I have a bulk pack of them, enough to refill the Tek.
This tubes are selected by the manufacturing for low noise.
My question:
Are they burned in by the manufacturer bec. they are selected, or will my calibration run away after some hours bec. they are fresh ? Then I have to make it self, calibrating a Tek is a very lot of work and I do not like to do that two times.
greetings
Martin
Tek 585A Ser. No 0015 he is one of the first made in Heerenveen, NL
I am restoring an old Tek 585A scope.
The tubes in the distributed amplifier section are "collected" from the pre owner, "to make it working". So there is a colored mix of ECC88, E88CC, 6DJ8, PCC88 (this is a 7v TV... ), some are good, some are tired, some are short before the end...
So I am planig to plug the complete stage with new old stock tubes, "CV2493" made by mullard, uk. I have a bulk pack of them, enough to refill the Tek.
This tubes are selected by the manufacturing for low noise.
My question:
Are they burned in by the manufacturer bec. they are selected, or will my calibration run away after some hours bec. they are fresh ? Then I have to make it self, calibrating a Tek is a very lot of work and I do not like to do that two times.
greetings
Martin
Tek 585A Ser. No 0015 he is one of the first made in Heerenveen, NL