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In the Forum: Melquiades Amplifier
In the Thread: Single-stage Melquiades vs. DHT amps
Post Subject: Conceptualizing Melquiades DSET is donePosted by Romy the Cat on: 2/21/2009
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 Romy the Cat wrote: |
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OK, now, after mach thinking, consulting and very little actual listening I have finally conceptualized my next move with powering Macondo MF channel. Considering that I have some extra space Melquiades’ budge here is the description what it will be:
The input will be absolutely unchanged from the “E” channel of my current 6-ch Milq.
http://www.goodsoundclub.com/PDF/6-Chennal_Melquiades_DSET_Amplifier.pdf
It will be the same filter, the same grid resistor bias, the same 6E6P at 200V but at 20mA inkstand of my current 35mA. Then it will be custom made by Bad Purvine, 75% nickel, limited 1.5H inductance, ~150Hz, 1:1, low turnes, low capacitance, inner-stage transformer. The transformer will be driving two grids on two tube sockets. One will be 2A3, 6A3 tube sockets with switchable 2.5V/6.3ACV. Another is RE604, LK460, KL71403, PX25, YO186 sockets with 4V. The AC balance on output tubes filaments will be set by 100R 5W high precision attenuators with 25 turns, sitting on the filaments secondary. The YO186 or 2A3 will be used interchangeably, one per time. They will be powered with cathode bias from 400V and presumed 60-70V on cathode for YO186. It is not clear if 2A3 would allow to use the same cathode resistor, if not then it will be a switch to add one more resistor in parallel to set on 2A3 approximately 40-50mA. I would like intentionally to drive 2A3-type tine with lower current in order to drive their plate impedance higher and to make it closer to YO186/RE604 type of tubes as I will have just one OPT transformer that will be running both plates and it will be DSET-type, with limited DC current and limited inductance. I do not care about the current clipping on 2A3 tube as I will have a low of wasted gain with my only one Vitavox S2 driver as load, so it will be VERY far from running at full power. The DSET output transformer is made by David Slagle, 80% nickel, limited 5H inductance, ~150Hz, 20:1, low turns, and low capacitance.
So, as the result I shall be able to have a little blood to drop but I will be able to drive all tubes that I would like to drive with juts puling one tube out and plugging another tube in. I do not see that the “universally” of this design implies any compromised in ether2A3 or YO186 chin. The space in the amps do allows me to afford this luxury, so why do not take advantage of it?
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