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Re: recommended parts for dc darling 1626 amp

Which version are you planning? Your link was to the "double DC darling", the DC-Darling is on Bob's site (link below).

I rarely use anything smaller than 1/2 watt as I don't stock them, with that in mind, if you are planning the double darling:

The 66K resistor will dissipate around 1 watt, so use a 2 watt part (metal film is fine).

The cathode resistor for the output which is 3200 ohm 10w per the schematic - use a wirewound. It dissipates around 7.5 watts, so even a 25w resistor wouldn't be overkill, and keep it away from other heat sensitive components.

The two 100 ohm grid resistors on the 1626's should be carbon composition 1/2 watt.

I'd suggest adding a small grid resistor before the 8532 (1K 1/2w carbon composition). I had oscillation problems with the 8532 in my version until I added this. BTW, the 6J4 is the same tube and a bit more common.

The 358 ohm resistor can be 1/2w metal film

The 1M can be 1/2w metal film.

Enjoy, it's a great little amp - and lots of "bang for the buck".

Don't waste much on designer parts, cheap will work nicely.

There are no coupling caps - Given the cap values stick with electrolytics and watch polarity.

FWIW, the single "regular" darling (eg, not DC coupled) might be an easier first project. DC coupling can be a bit tricky at times.

- Gary




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