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Old 6th May 2010, 05:18 PM   #1
bogg is offline bogg  Sweden
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Smile got hold of a bunch of tubes...

I got hold of a bunch of tubes from an almost 80 year old man here in Sweden. I paid $25 incl. shipping for all of these and as I do not know anything about tubes really (just got into the whole tube amplifier thing) I was wondering if any of these made the $25 worth it. Both moneywise and soundwise (if any of them are worth building a amp from).

Here goes the list (don't know what is important so I wrote down the things that seemed most significant)

2x GE GL-6136 ***** 6AU6W, seems unused
2x Brimar 5750 6BE6W CV4012 KB/FD (also looks like they are unused)
1 Philips QE03/10 (could be 0E03/10), in original box
1 Sylvania 6AU6A (926 AAR), unknown state
1 Sylvania 12BA6 (AUT 852), unknown state
1 RCA (GV) 6C4 (original box)
2 Philips Miniwatt EF94 (IMPORT)
3 LM Ericsson (SER) 2C51L
1 Sylvania 6EJ7 EF184
1 Philips 6360 QQE03/12 (IMPORT)
1 RCA 7435
1 RCA 6EV7
1 SER 403B
1 BRIMAR ECC83
1 BRIMAR 6C4
2 SER 6BA6
1 Tonic/Ebnic/Epnic (very hard to read) 6197
1 Telefunken 12BA6

Thanks for any clarification for what tubes these are, if they are worth anything and if I could build a decent Amp from any of them

Regards
Johan Bogg
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Old 6th May 2010, 08:33 PM   #2
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Most are radio tubes, but there are a few that can be useful in audio amps.
ECC83 and 2C51 are commonly used preamp tubes and if new, are probably worth a good proportion of the $25 between them. 6360 is a small transmitting tube that has been used successfully in small audio output stages, but of course you need two for stereo. Similarly with QE03/10.
A nice little headphone/low power SE amp could be made easily from a 2C51 and two 6360's.
The cost of transformers, though, will make the $25 look cheap.

Do a search on the web (or here) using the type number and see how many hits you get that relate to audio. That will tell you the usefulness of the others.

Gary
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Old 6th May 2010, 08:57 PM   #3
Arnulf is offline Arnulf  Europe
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In addition to what rotaspec already mentioend I think 6EV7 is interesting (seems like something along the lines of ECC81), you've got some of those pentodes in pairs so you can stick them in as CCS loads for the triodes.
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Old 6th May 2010, 09:07 PM   #4
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6AU6/6AU6A/EF94 are all equivalent, good little pentodes intended for RF but can be used effectively for AF. Also make good CCSs. Quality varies quita a bit and can be quite microphonic. Usually very cheap.
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Old 6th May 2010, 11:34 PM   #5
kmtang is offline kmtang  Canada
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Brimar ECC83 is good one for preamps.
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Old 7th May 2010, 07:20 AM   #6
bogg is offline bogg  Sweden
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Hi,

Thank you for the answers, I'll start reading up on tube amps and try creating something with the 2c51:s, possibly a preamp and amplifiying it further with a fet-amp of some sort.
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