Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on June 06, 2012, 10:01:06 am

Title: Odd NOS Tubes - 6S*7 series - are usable ??
Post by: kagliostro on June 06, 2012, 10:01:06 am

I've try to see if I find news about the use of this tubes (for guitar amp purpose) but wasn't able to find info

the tubes are

JAN CNU 6SA7GTY

JAN CG   6SR7

6SK7 (in a box labeled RTC la radiotecnique)

do you know something about ?

K

Title: Re: Odd NOS Tubes - 6S*7 series - are usable ??
Post by: Platefire on June 06, 2012, 12:12:29 pm

6SC7, 6SN7 and 6SL7 yes. Those you have I'm not familar with. Do a google search and you can probably find out more info on them. Platefire 

Title: Re: Odd NOS Tubes - 6S*7 series - are usable ??
Post by: DummyLoad on June 06, 2012, 02:15:54 pm

6SA7 - pentagrid (5 grids) - mostly used for RF mixer.
6SG7 - pentode, remote cut-off, not recommended for audio.
6SH7 - pentode, sharp cut-off, not recommended for audio.
6SK7 - pentode, remote cut-off - used mainly for RF/IF applications and AGC circuits.
6SQ7 - triode & duplex diodes - can be, the triode is close to 1/2 of a 12AX7 - plate resistance is slightly higher than 12AX7. ignore the 2 diodes.
6SR7 - triode & duplex diodes - can be, the triode is close to 1/2 of a 12AU7. ignore the 2 diodes.
6SS7 - pentode - remote cut-off - used mainly for RF/IF.
6SU7 - definitely, it's a 6SL7 with matched triodes. rare and priced accordingly. another variant is the 6188.
6SV7 - pentode, sharp cut-off - can be used for audio.
6SZ7 - triode & duplex diodes - can be, the triode is similar to 1/2 of a 6SL7/5751. ignore the 2 diodes.

 
--DL

Title: Re: Odd NOS Tubes - 6S*7 series - are usable ??
Post by: kagliostro on June 06, 2012, 04:39:20 pm

Many thanks friends

as always DummyLoad is an odd tube expert

only one thing

May be 6SH7 is not recommended for audio but Matcless don't care of it

see Clubman 35 schematic ( http://www.el34world.com/charts/Schematics/files/matchless/matchless_clubman.pdf (http://www.el34world.com/charts/Schematics/files/matchless/matchless_clubman.pdf) )

and don't forget 6SJ7 (champ 5C1)

about 6SA7 do you think it can be used instead of 6BE6 in the way Playmaster do ?

(http://www.ozvalveamps.org/playmaster/pm103cctamp_2joe.jpg)

(http://www.ozvalveamps.org/playmaster/pm102circuit20090624142858_00002dlch.jpg)

K

Title: Re: Odd NOS Tubes - 6S*7 series - are usable ??
Post by: DummyLoad on June 06, 2012, 04:51:31 pm

--6SA7 do you think it can be used instead of 6BE6

yes.

--DL

Title: Re: Odd NOS Tubes - 6S*7 series - are usable ??
Post by: HotBluePlates on June 07, 2012, 07:31:02 pm

Just know the 6SA7 is an octal, while the 6BE6 is a 7-pin miniature. You can use either in the same manner, but not in the same socket.