I just got a BUNCH of 6SN7 tubes from a TV shop, and dont know off hand of radios that use them. Were they more common in TV's or just radios I dont have in front of me or are they some kind of audio tube? Any light you can shed, would be very appreciated. Thanks...<BR>-Jeremy<P>------------------<BR>

About a jillion TV's used them, as well as a few radios and audio amplifiers, industrial equipment, test equipment, and on and on.....<BR>Definitely one of the most widely used tubes of all time. <BR>But out of the total, the number used in radio and audio amplifiers is a very small percentage.<BR>Certain brands and internal construction are sought by audio people who use them when custom building amps. The other 99% of 6SN7's are relatively far less valuable.<P>------------------<BR>Dennis

About a jillion tv's? I think I must have them all!! HAHAHAHA. Seriously, thanks Dennis, for the info. Since I dont have a jillion TV's to put them in, I guess they go on Evilbay.<P>-Jeremy<P>------------------<BR>

Jeremy<P> On eBay you might want to specify which brand. Like Dennis said audio guys like certain brands. To me they are all the same.<P> 6SN7 was used as vertical oscillator, vertical output, horizontal oscillator and sync tubes in late 1940's and 1950's TV's. Not unusual to find 3 in one TV.<P> They can make nice one tube radios.<P>------------------<BR>Norm

I never thought a whole lot of the 6SN7, other than just another tube. But lately audio people have started thinking it's really something. If they're the NOS stuff, be sure you list them as to brand AND color of plate, AND whether they have a black coating inside the glass. They'll pay more for stuff that seems unique. Whether it sounds better or worse only the buyer will ba able to answer. <BR>Mark D.<P>------------------<BR>Mark D. - Jack of all trades and master of none.

<P>ONE TUBE RADIOS?? Ok now you got me curious Norm, is this for real?<P>For the paltry price they will probably get, I dont know if its worth sorting them all by brand.<P>Thanks for the info Norm...<BR>-Jeremy<P>------------------<BR>

Huh, just saw Marks post. After all this info from you fine folks, maybe I better check Ebay prices before I just lump them and dump them on Ebay. Thanks Mark...<BR>-Jeremy<P>------------------<BR>

These tubes had many uses, they were uses in tone generators in electronic organs, used as vert. and horz. oscillators in TV's, phase inverters in amplifiers, etc. very common.<BR>========================================<BR><P>------------------<BR>Bill Benson

Hi Jeremy<P> Emailed you information I wrote for CHRS & SCARS on building a 1 tube radio using a 6SN7. It can drive a speaker. <P> In 1950 8.45% of the tubes being used in TV were 6SN7. This was only exceeded by 6AU6 & 6AG5. <P>------------------<BR>Norm

Hi Jeremy, I can tell you that it is in the reciently added tube types section of the 1940 RCA tube manual. Says; twin triode amp with seperate cathode terminals for each unit. Designed for resistance coupled amps and phase inverter.<P>By 1959 the GT and GTA were discontinued. The GTB is listed as a medium-mu twin triode. Several TV uses are noted, as well as the resistance coupled amp thing. Speaks of use in mulivibrator circuts also. (Same as phase inverter?) <P>Over my head mostly, but as Standley of Lye Soap fame would say: It's inthebook!<P>------------------<BR>terry h

Jeremy<BR>If you decide to lump them and dump them, let me know. I'll go in there and get them. Unless they go too crazy. <BR>After all, I admit I play with audio stuff, too. <BR>Mark D.<P>------------------<BR>Mark D. - Jack of all trades and master of none.

Seems there is even a car radio ('49 or '50 Ford, not sure which supplier) that uses a 6SN7 as a first audio/phase inverter tube. There was an experimetners kit the Burstein and Applebee used to sell that used a 6SN7. They used to sell a blue million of those tubes back in tube type TV days.<P>------------------<BR>

Terry H--good one, I love "It's in the book". It was number one on Billboard charts sometime in 1952.<P>------------------<BR>

The 50's Radio Amateur's Handbooks had a 1 tube 6SN7 radio(regenerative detector plus audio stage). I built one about 35 years ago. There's a copy online - <A HREF="http://www.algonet.se/~janax/50-regen.htm" TARGET=_blank>http://www.algonet.se/~janax/50-regen.htm</A> <P>------------------<BR>

<B>>>For the paltry price they will probably get, I dont know if its worth sorting them all by brand.</B><P>For anything 1950 or older (except perhaps RCAs) it will be well worth your while to sort them by brand and type. You'd be amazed what those Audiophile can hear.<P>------------------<BR>

HOLY CROW BATMAN!!! I just looked up these things on Ebay, those audio guys must have the most bestest ears in the world to pay those prices!! ONE PAIR went as high as $315. Thats just plain silly if you ask me, but who am I to deny them their sought after tubes? <Insert evil grin here> Thanks for the info guys. And thanks to Norm for sending me the schematic for that one tube radio. I'll have to save at least one 6SN7, just so I can build that. <IMG SRC="http://antiqueradios.com/forums/smile.gif"><P>-Jeremy<P>------------------<BR>

Uh, Jeremy<BR>Do you have, or have access to a tube tester? <BR>I ask because if you plan to sell a lot of these tubes, they're worth a lot more if you can test them and report the results in the promotion. <BR>Also, if you have a gm tester, you can then tell the ones that "test as new" and the ones that "test used but still very good" <BR>On ebay, nothing ever tests less than "used but still very good." <BR>Also, with a gm tester, you can pick some that conduct within 10% of each other and then you have a "matched pair." <BR>A matched pair will sell for much more. I don't know why. It's just that they do. But they have to be same brand and style. (Look the same) <BR>I know, I know. It's a lot of screwing around. But, that translates to more money.<BR>Mark D.<P>------------------<BR>Mark D. - Jack of all trades and master of none.

Don't forget the early computers like ENIAC which used them by the ton. They were perfect for flip-flops.<P>------------------<BR>

Military equipment used a lot of these tubes.<P>------------------<BR>

yeah, and I remember an old Univac computer I had to work with during my stint in electronics school. It had something like 2500 12AU7's!<BR>It couldn't do as much as my desk calculator does today, but it sure looked cool. <BR>Mark D.<P>------------------<BR>Mark D. - Jack of all trades and master of none.