[Community TV Pt. 1] Decisions, decisions.

[Username1]

not to derail you, but a good thing to consider as far as community stuff would be a few tools that you may only use once a year, Like community/rental crt tester, alignment things, stuff one might only use once or twice in two years. Maybe a really good crt tester and it could be rented for 30 days returned, and kept by one person???? really good wood case..... Well that is what I think as far as a community thing goes.....

[fsjonsey]

What would really make this interesting is if we would use only tubes in current production, wherever possible. I understand that some tubes, like HV rectifiers, would be impossible to find.
But there are many tubes in production for audio use that would work in video circuits, and were used in TV sets in the past. EF86 pentodes, 12bh7's, 6FQ7's, big tetrodes like 6L6GC's or 6550's as Horizontal output tubes, etc...

These links are just an example of the variety of tubes in production today.
http://www.tubedepot.com/elha.html
http://www.tubedepot.com/jjtesla.html
http://www.tubedepot.com/sino.html
http://www.tubedepot.com/sovtek.html

[zenith2134]

Hi, about the current-productions tubes: I'd recommend that you avoid Sino and JJ. Having used many (most) brands of modern tubes for hi-fi, these are the only two brands which have given me trouble(redplating, arcing, general loss of fidelity after a very short time).

I can wholeheartedly recommend some Chinese and Russian tubes however--Electro-Harmonix, Tung Sol, Genalex, Sovtek. My main hifi amplifier just got a new matched quad of EL34B-HT from Ruby Tubes (chinese Shuguang) which sound superb.

[Zenith26kc20]

I see I'm not the only one to see JJ tubes expire. Getting back on track, I think some of the larger audio output tubes (KT90, KT120) are rated at rather high plate voltage making them a possibility for sweep output tubes.
The next question is what flyback for use with them.

[fsjonsey]

Originally Posted by zenith2134

Hi, about the current-productions tubes: I'd recommend that you avoid Sino and JJ. Having used many (most) brands of modern tubes for hi-fi, these are the only two brands which have given me trouble(redplating, arcing, general loss of fidelity after a very short time).

I can wholeheartedly recommend some Chinese and Russian tubes however--Electro-Harmonix, Tung Sol, Genalex, Sovtek. My main hifi amplifier just got a new matched quad of EL34B-HT from Ruby Tubes (chinese Shuguang) which sound superb.

I totally agree about JJ when it comes to octal power tubes and rectifiers. Some of their small signal tubes are quite good though, and their newly engineered ECC99 dual triode is an interesting animal.

Originally Posted by Zenith26kc20

I see I'm not the only one to see JJ tubes expire. Getting back on track, I think some of the larger audio output tubes (KT90, KT120) are rated at rather high plate voltage making them a possibility for sweep output tubes.
The next question is what flyback for use with them.

As far as sweep tubes go, there is an actual sweep tube in current production, the 6KG6/EL509/6P45S, made in Russia by SED/Winged C. It's a robust, well made tube. OTL amp guys love them. http://www.sed-usa.com/index.asp?str...&strPage=EL509