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In the Forum: Melquiades Amplifier
In the Thread: The one-stage Melquiades.
Post Subject: Another single stage amp...Posted by Romy the Cat on: 5/1/2007
 op.9 wrote:
I now run my 'tweeter' amp 1st order high pass at 2200hz (driving BMS 4540nd in 1500hz leCleach horn) so my impressions might have some bearing on Romy's new amps. I was playing around with operating points and components in my single 5842 amp when the sowter mumetals arrived. Immediately all my energy went into listening to music again. First impression were of real power and grip! A sort of palpable sound - always my holy grail (maybe this is analogous to romy's 'connectivity'?) My BMS4540 nd drivers had never sounded like this before - it has taken a few months to realise quite how good they are. Only later did I notice a huge increase in delicacy and detail. Its not a 'flashy' sound at all, in fact now I'm happy to take my tweeter amp for granted, and forget about it. Interestingly, I was using a single 5842 for a long while until I realised that I didn't have enough system gain. Now I'm using a 5842 RC driving an EL84 triode-connected and I have to say that 98% of all the good things about the 5842 are in control of the amp. The 2% EL84 adds a nice 'sexy shimmer' to the sound. I'm not at all surprised that the Milq's driver stage sounds so close to the original and I'm very interested to see if a fully optimised single-stage could outdo the full Milq. . .
Interesting comments about the Sowter MuMetal, I will consider them. Yes, with your high-passed BMS4540 you are in the same boat as me. Even more interesting in context of what I am trying to do now were your attempts to use a single stage amp to drive your HF horn. BTW, the low power 5842 with it’s 1.3V of bias and no feedback is not the best choice for power amp’ input as (as I understand) to drive the tube to the reasonable volume your input voltage will be larger then bias voltage.

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