valve buffer gainclone

[jaste]

Alright, moderators this is it!

Im planing to build a valve-buffered gainclone. Here you can see the sheduale

http://www.customanalogue.com/diytub...one/design.htm

(Thanks btw!)

I´ve got some tubes already but i dont know which one to use:

Telefunken EF 184

telefunken CH 84

Philips ECC 82

Telefunken UF 80

Thank you very much!

[ilimzn]

If you are making a stereo amp and want to use only one tube then the only one you can use is the ECC82. If you have pairs, then in theory you could use any of them, properly connected, and of course, with the proper heater supply.
Your CH84 is probably an ECH or UCH84 but the first letter got rubbed out (be careful, the markings tend to rub off easily on some tubes!)

[jaste]

thanks! Since I´m totaly new at working with tubes, can you give me any advise on how to wire up the tube? Which pin does what?

Thank you in advance!

[Nordic]

Have a look at Franz's amps

Projects for next hollidays (the world smallest VBITNGC??)

http://www.diyaudio.com/forums/attac...amp=1129829972

[SY]

Originally posted by jaste
thanks! Since I´m totaly new at working with tubes, can you give me any advise on how to wire up the tube? Which pin does what?

Thank you in advance!

If you've never worked with tubes before, make sure you read the sticky thread on high voltages and safety. Unlike most solid state equipment, tubs run at LETHAL voltages and can kill the unwary. Work with a companion, preferably an old guy who knows his way around the dangers, but at minimum, someone who can quickly turn off the power and call an ambulance.

[Nordic]

Think I'm gonna join you in this build...

Ok just found this, sure hope the site has autosize...

I see on there, EL86 or 6CW5 is identified as Hifi amplifier, would this be suitable in a configuration like above? I see many on ebay for 1 dollar.

[ilimzn]

Not really, EL86 would be the tube equivalent to a low voltage, high current medium power transistor - it could be used in a buffer but that would be only if you really had nothing else to use. Even as a tube power amp it requires relatively non-standard operating conditions, which is why it is not very popular in that application, and why it is cheap. The EL84 would be the 'usual' tube for that power level, just check on prices for those and you'll know what I mean.

Perhaps the best tube to use as a buffer from your table would be the 6DJ9/ECC88 (and many other tubes from that same family!), although a 6AQ8/ECC85 would also do OK. The good thing about the 6DJ8 is that, as tubes go, it is a low voltage tube, which will reduce the potential of someone getting fatally electrocuted, and, it sounds good too

[Nordic]

Many thanks, I see Franz, used the ECC88 as well, doesnt seem too hard to get, even here.

These are the ECC88 types I can get, could you recommend any specific one maybe, based on brand knowledge or eperience...

ECC88/6DJ8 Various cheapies
6DJ8EG EI
E88CC Gold pins Mullard, Siemens
E88CC/6922EH SOVTEK
E88CC/6922EH SOVTEK
E88CC/6922 SOVTEK
ECC88 Mullard, Philips
E188CC/7308 USA
CCa Gold pins Siemens
6N1-P Svetlana

[ilimzn]

7308 seem to be preferred (but also NOT cheap) although I had very good results with Siemens E88CC (normally also not at all cheap). You may add PCC88 to your list as a cheap one that may actually still be quite decent. In most cases you can put a PCC88 instead of an ECC88 and have it work perfectly (though substitution the other way is less likely to work). I have had used Ei PCC88s out of old TV sets work as good as some NOS even though they were probably run right to the limit for who knows how many years, so assuming they still do them like that or better, Ei might be a good but acceptably priced choice. You may want to look into getting a few cheapos just to experiment with till you get everything right.

[Nordic]

OK will get cheapies first as one ecc88 costs about what 2 cheapies do.