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Ah, that definitely rules out mine being any kind of 300 series as it only has the 4 power tubes. Just out of interest though, I did try putting the EL34's on the inside sockets and the 6L6's on the outside and with this configuration I am able to switch between 'Simul-Class' and 'Class A'...

So all Series 300 amps would have 6 power tubes. No Series 300 amps were ever produced with just 4 power tubes?

Thank you for all of your replies so far, really appreciated. Even though various sites online and the manual clearly states that the mark III Simul-Class should have two EL34's in the outer socket and two 6L6's in the inner sockets, I have just seen in the Mark III manual that: "Series 300...

Hi all, hope you are having a great day! I've just joined the forum so here is my "hello". I'm hoping that I will be able to find some help in diagnosing an issue with my Mark III Simul-Class (Red Stripe) which I have started a thread about here...

Since my original post above I have tried replacing the two El34's in the outer sockets with a pair from another amp so that I can rule out that it's not the new tubes that are at fault and causing the problem when the amp is switched to 'Class A' mode, but the issue with the amp remains the...

Hi there First time poster here and I'm hoping that someone can assist me in diagnosing an issue that I am experiencing with my Mark III. I have recently replaced the power tubes in my Mark III simul-class (red stripe) and following the advice and instructions given in the user manual I have...