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In the Forum: Melquiades Amplifier
In the Thread: Single-stage Melquiades vs. DHT amps
Post Subject: Physical characteristics of electronic devicesPosted by drdna on: 12/3/2008
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 nl wrote:
The 45 is a wonderful tube for running compression drivers.

Many people like carbon comp resistors for the plate load, and paper/oil capacitors for the coupling cap here.

PIOs take some time to break in.

Of course you want to use a good 6SN7, not a new-production Russian or Chinese model.

...a decent powersupply that doesn't sound drecky (which probably means NO cheap high-value industrial grade electrolytics...

Pay attention to the quality of the filament supply...the 26 takes a VERY high quality filament supply. I use batteries with a cap and choke with my 01As.
This is my point. We often say these things, like "use a paper/oil cap or air cap here or there" and we think about capacitance, inductance, resistance, etc. but we ignore all the other physical characteristics of the device and how it interacts in the circuit. Like judging a house we are going to buy from the number of bedrooms and bathrooms, when we should be thinking: it is poorly insulated so we need a good furnace for it; or it has a large garage so we have plenty of extra storage space.

I would be interested if we could think about WHY we make these choices and have these preferences, and see if we can formulate some experiments to confirm it. It might give us a lot of power in tuning a system.

I would like to hear people's ideas. Smile

Adrian

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