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Valves / Vacuum Tubes
Dynaco st70 help please gents....
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<blockquote data-quote="charles" data-source="post: 364079" data-attributes="member: 2759"><p>Dear Andre,</p><p></p><p>So the set working fine after the pre and PSU modifications were done. If now faulty, check all the wiring and connections related to the modifications. Also check the South African modification they did on some of the ST70's -a green high wattage resistor on top side of the amp to drop the 250VAC to 110VAC - check its connections. Also just for the sake of it change the GZ34 rectifier - new ones may also be faulty. </p><p></p><p>I like the ST70's. A couple of days ago I obtained a very good cosmetic and original one in a working condition. These sets are very reliable and one can use it flat out for hours on end (I did that to another one of mine). I am always looking for more ST70's. </p><p></p><p>One of the few sets that one can (according to its manual) use as a mono set to give one double the power output -it has a mono switch. One has to do some bridging with links to achieve it. </p><p></p><p>I never seen one with the Triode Electronics modifications. So I cannot comment on it. All the best with the repair of the ST70.</p><p></p><p>Kind Regards</p><p></p><p>Charles</p></blockquote><p></p>
[QUOTE="charles, post: 364079, member: 2759"] Dear Andre, So the set working fine after the pre and PSU modifications were done. If now faulty, check all the wiring and connections related to the modifications. Also check the South African modification they did on some of the ST70's -a green high wattage resistor on top side of the amp to drop the 250VAC to 110VAC - check its connections. Also just for the sake of it change the GZ34 rectifier - new ones may also be faulty. I like the ST70's. A couple of days ago I obtained a very good cosmetic and original one in a working condition. These sets are very reliable and one can use it flat out for hours on end (I did that to another one of mine). I am always looking for more ST70's. One of the few sets that one can (according to its manual) use as a mono set to give one double the power output -it has a mono switch. One has to do some bridging with links to achieve it. I never seen one with the Triode Electronics modifications. So I cannot comment on it. All the best with the repair of the ST70. Kind Regards Charles [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Dynaco st70 help please gents....
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