Musicman HD212

[Stratman]

Re: Musicman HD212

There are a few current prouduction 6CA7's right now and you can use EL34's in those amps, and in fact a lot of those MM amps CAME with EL34's in them.

Here are 2 6CA7's from The Tube Store...

http://www.thetubestore.com/eiel34.html

http://www.thetubestore.com/ehx6ca7.html

This information is not actually correct... AND here is why.

The USA GT-6CA7 ... still a rumor out there, but here are some of the real ones in a 750 volt B+ amp, a Music Man after running some tests. These are not just a big bottle EL-34 as other folks are selling as 6CA7 tubes today. These are the real deal, off the original tooling as used by GE. These also have an active beam forming element, a critical item missing in the "6CA7" / EL-34 big bottle "conversions" sold today by some other vendors.

http://www.guitaramplifierblueprinting.com/GTsecrets.html

The particular Musicman amp (212HD130) that I own uses much higher B+ voltage than normal EL-34 tubes are designed to handle.

http://www.pacair.com/discus/messages/23/118.html?1145793386

http://www.pacair.com/discus/messages/23/911.html?1128080547

BTW - It is my understanding the aforementioned "WWW.PACAIR.COM" forum is run by one of the designers of the musicman amps, who used to work at musicman.

Mike Kropotkin of KOS tubes mentioned that EL-34 tubes may be a poor fit for MM amps, due to the high plate voltages of MM amps. He recommended 6AC7s instead.