dynakitst70useddynakit st70Dyna ST70 working well modified: one side set up for 6L6 (higher bias voltage). both pairs output tubes wired in triode mode, less power and distortion. 7199 replaced with 6GH8A which is more avai...300.00

dynakit st70 [Expired]


no longer for sale

Dyna ST70

working well

modified:

one side set up for 6L6 (higher bias voltage).

both pairs output tubes wired in triode mode, less power and distortion.

7199 replaced with 6GH8A which is more available and sounds better.

Replaced 4 coupling caps with better.

replaced rectifier tube with diodes giving a bit more voltage and therefore power.

Added volume controls.

has one pair of 6L6GC and one pair EL34 tubes.

Tested for clean power, see scope shot.

6L6 14W into 9.4 Ω (what I had)

El34 20W into 9.6 Ω (what I had)

I had built this to bi-amp a single set of speakers as |I am deaf in one ear. I have since gotten a simpler system.

Will entertain offers.  Will modify for a price, ask.

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