This is a unit that has been in storage since 1991. It is all original with original circuit using 7199 tubes. It has new JJ tubes from Tube Depot which I put in three years ago when I took it out of storage and ran it for several weeks.
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This kit will update one ST-70 or SCA-35 amplifier, or 2, Mark II, III, IV or Heath-Kit W-4 mono-block amplifiers, one Marantz 8B amplifier or one H-K Citation II amplifier. Sorry, but these will not fit the ST-35 amplifier.
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Miller Audio LLC Introduces the new Dynaco ST-70 / Dyna-70 Ultimate Upgrade w/ Automatic Bias. The Dyna-70 Ultimate Upgrade with Automatic Bias (aka AB or Auto Bias) is the newest version of the Dyna-70 Ultimate Upgrade kit.
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ADULT SIGN. Shows signs of wear from age but presents well. Power output: 35 watts per channel into 8Ω (stereo).
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Miller Audio LLC Introduces the new Dynaco ST-70 / Dyna-70 Ultimate Upgrade w/ Manual Bias. The Dyna-70 Ultimate Upgrade is just that-. Mounting the new PC board(s) and completing wiring & final assembly, setting bias (Manual Bias Kit).
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This kit will replace the original Dynaco driver circuit and printed circuit board, using the excellent sounding 6SN7 triode. Tubes are NOT included with the kit! The benefits of upgrading your Dynaco ST-70 amp with our Dynaco ST-70 AB kit are.
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Sorry, but these will not fit the ST-35 amplifier. This kit will update one ST-70 or SCA-35 amplifier, or 2, Mark II, III, IV or Heath-Kit W-4 mono-block amplifiers, one Marantz 8B amplifier or one H-K Citation II amplifier.
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DYNACO ST-70 6GH8A / 6GH8 COMPLETE STUFFED PC-3 DRIVER BOARD WITH TUBES (NOS Platinum matched pair of 6GH8A ECF82 Mullard Made in Great Britain). This is Dynaco ST-70 driver board PC-3. You can find many quality NOS tubes of any of these types for normal prices and you can enjoy tube rolling with this driver board.
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