32 NOS RCA 1644 (12L6-GT) Twin Pentode tubes

karma · 17th July 2004, 02:05 PM

i got these tubes cheap on e-bay. anyone ever maid a amp with em?

what would you use em for

Frank Berry · 17th July 2004, 02:46 PM

The RCA 1644 tube is a 12L8. Not a 12L6. The two sections share a common cathode.
They were probably designed to be used in the output stage of radio receivers.

karma · 17th July 2004, 04:11 PM

thanks frank ill just add em to the rest of em. maybe down the road i can use em.

only cost me $11

Colt45 · 17th July 2004, 07:46 PM

yeah, it's a 12L8.

shared cathode and screen, so ideal for PP.

but, unfortunately it is rated only 2,5w Pa, each section.. so flea power, unless you use your whole set in PPP

karma · 31st July 2004, 01:06 AM

where can i find a pdf of the pinout of this tube?

thanks.........

rdf · 31st July 2004, 01:54 AM

Quote:

Originally posted by karma
where can i find a pdf of the pinout of this tube?

thanks.........

Not a .pdf, but some info:

http://hereford.ampr.org/cgi-bin/tube?tube=1644

fdegrove · 31st July 2004, 01:59 AM

Hi,

........The datasheet for the 12L8 in PDF format.

DUNCAN AMPS

Cheers,

karma · 31st July 2004, 02:54 AM

ahh thanks heh only 180 max volts on the plate hmm.

wonder if i could make a headphone amp with a few

nah not now i still gota finished my other tube amp first

thanks.........

Shoog · 12th September 2009, 11:30 AM

Hi all,
Just searched up this thread.
I have been toying with the idea of building a two stage direct coupled 6080 amp for ages now. The idea is to hang the pentode driver off the finals and direct couple a LTP into a differential PP output.
I have been searching for a suitable driver which would allow me to build this as a two valve per channel design. I was toying with compactrons, but they are a pain because they never caught on in Europe and so the bases and valves are hard to come by. So I was almost going to give up when I did a painstaking search of the valve lists and came up with the 12L8-GT. Seems that this is almost perfect for the job and the curves don't look to bad.

So my question is, has anyone ever used them for anything, and if so how do they sound. Also has anyone got a source for them in Europe?

Shoog

17th July 2004, 02:46 PM	#2
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	The RCA 1644 tube is a 12L8. Not a 12L6. The two sections share a common cathode. They were probably designed to be used in the output stage of radio receivers. __________________ Frank

31st July 2004, 01:59 AM	#7
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, ........The datasheet for the 12L8 in PDF format. DUNCAN AMPS Cheers, __________________ Frank

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17th July 2004, 04:11 PM	#3
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	thanks frank ill just add em to the rest of em. maybe down the road i can use em. only cost me $11

17th July 2004, 07:46 PM	#4
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	yeah, it's a 12L8. shared cathode and screen, so ideal for PP. but, unfortunately it is rated only 2,5w Pa, each section.. so flea power, unless you use your whole set in PPP

31st July 2004, 01:06 AM	#5
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	where can i find a pdf of the pinout of this tube? thanks.........

31st July 2004, 02:54 AM	#8
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	ahh thanks heh only 180 max volts on the plate hmm. wonder if i could make a headphone amp with a few nah not now i still gota finished my other tube amp first thanks.........

12th September 2009, 11:30 AM	#9
Shoog diyAudio Member Join Date: Aug 2002 Location: Eire	Hi all, Just searched up this thread. I have been toying with the idea of building a two stage direct coupled 6080 amp for ages now. The idea is to hang the pentode driver off the finals and direct couple a LTP into a differential PP output. I have been searching for a suitable driver which would allow me to build this as a two valve per channel design. I was toying with compactrons, but they are a pain because they never caught on in Europe and so the bases and valves are hard to come by. So I was almost going to give up when I did a painstaking search of the valve lists and came up with the 12L8-GT. Seems that this is almost perfect for the job and the curves don't look to bad. So my question is, has anyone ever used them for anything, and if so how do they sound. Also has anyone got a source for them in Europe? Shoog

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