Old Marshall JCM900 found with 6L6 tubes

[DesertRose]

Re: Old Marshall JCM900 found with 6L6 tubes

..... where on earth can I locate the serial number ..
I notice a white piece of bar code sticker behind the amp with this number written just bottom of the bar code:
972645527

Could this be the serial number ?
Thanks

[ErikH]

Re: Old Marshall JCM900 found with 6L6 tubes

What you have there is a 1997 Hi Gain Dual Reverb combo. It came stock with 5881's so having the 6L6's is not a problem, just a simple rebias.

I will tell you this, and several techs have told me this. Changing from 5881's or 6L6's to EL34's will require a resistor change (4 actually, 1 for each tube). Every tech I've talked to, even my own, has said the same thing.

LPB: I thought the swap to 5881's occured somewhere in late 1993 to early 1994. I could be wrong though.

[DesertRose]

Re: Old Marshall JCM900 found with 6L6 tubes

gosh .. then I'm conned by the salesman.
See my topic is "OLD" JCM900 found ... blah blah

So i thought is was as "OLD" as the early 90s, Darn it , if i knew i won't even consider getting it. So just a resistor change for each tube will do ?? Nothing more than that

[ErikH]

Re: Old Marshall JCM900 found with 6L6 tubes

gosh .. then I'm conned by the salesman.
See my topic is "OLD" JCM900 found ... blah blah

So i thought is was as "OLD" as the early 90s, Darn it , if i knew i won't even consider getting it. So just a resistor change for each tube will do ?? Nothing more than that

It technically is old. Almost 9 years.

From what I've been told, yes, just a resistor change. If you like how it sounds now, keep it the way it is. Other than the 6L6's being in there it's essentially stock.

[DesertRose]

Re: Old Marshall JCM900 found with 6L6 tubes

any diff between the 5881 and 6L6s ?

[ErikH]

Re: Old Marshall JCM900 found with 6L6 tubes

any diff between the 5881 and 6L6s ?

Dunno. I never played a 6L6 loaded Marshall. Only EL34, 5881 and 6550. I prefer the EL34's but everyone has different tastes.

Maybe Zerb will chime in when he wakes up.

[DesertRose]

Re: Old Marshall JCM900 found with 6L6 tubes

I'll then experiment with the 5881s also,
i realize that the current vintage reissue Marshall uses 5881
Think the current ones ain't as good as the last time, but I guess since they use 5881 now I believe it isn't so bad

i'm just comforting myself . duh

[DesertRose]

Re: Old Marshall JCM900 found with 6L6 tubes

I managed to take the darn tube outta there amp.
I didn't know that it was that simple, i had the idea that I gotta unscrew the top and then do some stuff before I can pull the tube out

here's a pick of it .. I hope those Marshall users ain't pissed off when they see this