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Author Topic: ART-13 Audio Amplifier  (Read 2071 times)
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Patrick J. / KD5OEI
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« on: July 03, 2023, 08:05:55 PM »

Found an ART-13 Audio Amplifier module in a box of stuff. It looks pretty nice. Compact for something that will take a micropohone and drive 811A grids.

The ART-13 has clear audio, but not the best frequency response due to smallish modulation transfomer. I wonder if the speech amp module can do better especially on the lows - the limitation being in the mod iron?

Some capacitors may have to be changed, I can see that.

The iron 'size' looks OK for the 3W or so the 811 grids might need, but I haven't had time to mess with anything from this estate yet. Just trying to finish getting what's left out of the garage.

* ART-13 audio amplifier schematics.pdf (2570.6 KB - downloaded 93 times.)
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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« Reply #1 on: July 03, 2023, 08:51:00 PM »

Patrick....  I have used several of those transformers with good result..    T 202 with the split secondary is a good one to use for the 50's era Handbook 6L6 speech amp.. and others..   Ive never played with a complete art13 speech amp..  Have fun..
Steve
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Opcom
Patrick J. / KD5OEI
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« Reply #2 on: July 06, 2023, 10:20:02 AM »

That's great news! Just collecting few audio-ish things from the estate spoils and like the idea of driving other grids with that.

Brain was stuck on 811s and didn't notice the many possibilities there.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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« Reply #3 on: July 06, 2023, 10:47:17 AM »

When Ray, WD2AFJ was tooling around with the MK-214D that I ultimately bought from him, he made a modulator using the mod iron from an ART-13. He took a pair of 572B's and modulated P-P 813's before ultimately making a 'beefier' 805 modulator. Don't over look that transformer either!
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Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
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