thanks for the info folks

the amount of clean headroom is about the same. the 50n is abit brighter and more aggressive than the 45. it has a bit more distortion and is a little tighter. the 50 is more rock while the 45 is more blues. if you play in a loud 2 guitar band, I'd recommend the 50

shouldn't this post be called overtone special?
anyway, i want an ac30!

qouted from http://www.thegearpage.net/board/showthread.php?t=331010&page=2

here's a quote from Mr Zimmerman who if i remember right based alot of his amp design on neil young's sound.

"Actually, Lord Valve, himself, told me a while ago, the secret behind Neil Young's amp. Take a tweed deluxe, change the power tubes to 6L6s (apparently Chineses), change the cathode resistor 200 or 220 ohms. I would add that the rectifier should be changed to a 5U4. Top it off with a Jensen C12N speaker, and you will probably get about 20 watts.
Of course, neither Lord Valve nor I can tell you how he convey so much passion and emotion in a single note.
I've been using the new Jensen C12N reissue in the Zeeta 50, and I have to say I've been pretty damn happy with them"
David Zimmerman - Maven Peal Instruments, Inc

I'd love to build an ac30. I think I going for the 1963 ac30/6 (top boost) circuit, but with the ef86 from the earlier ac30/4 circuit. that would be the best of both worlds

can you use two gz34s for less sag?

my babies are:

fender style:
lil dawg champster
clark blonde piedmont (6g6b blonde bassman clone9
clark rockford reverb (vibroverb with 12")

marshall style:
metro 1965 jtm45
metro/marstran 1967 jmt50
metro 1968 jmp50

trainwreckish:
ceriatone express with custom oak cab
ceriatone komet 60 without cab
alessandro rottweiler (a bit wreckish and fenderish)

others:
kosh multitone 50 2x12" for sale

I got a schematic. send me a pm and I'll send it to you.  I'm in copenhagen for 5 months now - without my amps. so I cant report now. but when I and some tech friends fired here up she sounded loud and aggressive

for pics, see: http://forum.metroamp.com/viewtopic.php?p=158127#158127
http://forum.metroamp.com/viewtopic.php?p=158127#158127

I've spent the night recording a 6g6b. great amp!

+ 1 on this

just try to adjust the bias pot. if you don't have enough range with the 6v6s, then you need to change the resistor. this is the 56k resistor connected to the 22k pot on the left.
greg germino seems to recommend a 5Y3 or 5U4 rectifer if you run 6v6s in a jtm45

I'm using sylcanias. sound bright, clear and less compressed than the el34s.
I bias a -30v at pin 5 (like ken fischer recommended) and at 49ma at pin8

jj 6v6s will work. but adjust the bias. you might have to change the bias resistor

+ 1 on the svt - make a old one