Calling Lamm ML2.1 owners

Thanks Syntax but my questions is how long before I replace new ones as they are on the amp for 10 years now. I have replaced the 6n6p many times already!

Send Vlad an email, but I suspect you could use some fresh tubes. And my recollection was, those weren't necessarily expensive. The only one I roll in mine (ML2) is, like the Syntax, the 12ax7.

The 5651s are not expensive. About $8 each. I bought some because I had a problem with one amp where the 5651 went dark. When I looked inside, the internal fuse had blown.

Replaced the 5651 and the internal fuse and it worked for 20mins and the fuse blew again. I ran in mono for a while, thinking I had to send the amps to Lamm - which was a bit of a logistics issue. But finally I contacted Erina and she told me what to do.

The problem was that the 6C33C voltage regulator was old and not doing its job. I had a spare set of 4 x 6C33Cs from Lamm (all correct numbered parts for the amps) sitting in the cupboard. I replaced the whole set - they were all quite used up, one significantly so. These were the original valves, except for 1 - so they had done some miles (I bought the amps second hand).

There was actually nothing wrong with the 5651 voltage reference tube so I put it back in.

I've replaced the 6N6Ps once and will do so again in January. I use Pvane 12AX7s.

Regards,

In terms of those 6c33c. I have brought a set from Thetubestore and worked fine. I read that they need to be carefully matched but lucky not so in my case. It seems as long as it is within range for correct bias to be set, it is fine. I know the regulation tube actually goes sooner than the power tube. Cheers.

I own my ML2.1 maybe 4 years now and I haven't replaced any tube. The datas are all ok, the units are very reliable. But I use them with 99dB Speakers, anyway, there is worse out there...check the Pins (that they are clean), take care that the Tube sockets have a good grip, that's it.