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In the Forum: Melquiades Amplifier
In the Thread: Staxquiades project
Post Subject: Reliable.Posted by Romy the Cat on: 9/25/2012
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 N-set wrote:
I do have some serious concerns with respect to my design, the LF stability beeing the most important one (before we even approach talking about the Sound...if any); you may rememebr I was asking you about the stability and reliabilty of 6E5, as the driver is the most cruicial element here
(for example it provides the bias to the output via the voltage drop on the RDC of the interstage choke). Again, the sims show it can work but I think I've reached the point the sims will give me no further insight
 
Well, in those DC-couple applications the stability of the driver is very important and bias of output stage sits on a head of the plate current of the driver. In your case you a choke between but it is essentially the same thing. I do not have problem with 6E5P and I do run my MF DSET in exactly the same application, driving way more expensive and hard to get tube then 300B. The 6E5P might have low plate current from start (as any other Russian tube) and I did come across 2-3 tube that did not give me enough current and I trashed them but if it give the right current at nominal bias then it will hold the current very stable. At least I did not have any problems with 6E5P/6E6P that I accepted. If you want to be even more confident then get 6E6P-DR. They are even more reliable then 6E5P, particularly at low voltages you use them at.

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