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Audio and Video Talk
The Vintage Audio Section
Lafayette Superheterodyne Radio - 1935
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<blockquote data-quote="Des Miles" data-source="post: 1005702" data-attributes="member: 14311"><p>Seems like a real nice project. I agree though, replacement valves may be a problem, great if Charles can assist. The 80 rectifier, if faulty, can easily be replaced by any number of 5v. rectifiers. I've used GZ34 on a few occasions , simply because I had some, 5Y3GT will also work.</p><p></p><p>Everyone has their own line of approach, I would put only the 80 back and while carefully measuring the HT, slowly power up using variac to see if HT comes up and settles at 200 - 250 volts or so. If OK , I would then use a R2k 10 watt or so resistor in place of the field winding and connect a PM speaker to the output transformer. With all the valves replaced, bring the power up again (still watching HT voltage) to see if there is any indication of audio output and possible RF noise. At least then you know there's a good chance and re-capping inevitably brings about a great improvement in overall operation. If the set is completely dead (audio wise) then obviously will have to fault-find section by section. </p><p></p><p>Just my thoughts, good luck if you tackle this full on !</p></blockquote><p></p>
[QUOTE="Des Miles, post: 1005702, member: 14311"] Seems like a real nice project. I agree though, replacement valves may be a problem, great if Charles can assist. The 80 rectifier, if faulty, can easily be replaced by any number of 5v. rectifiers. I've used GZ34 on a few occasions , simply because I had some, 5Y3GT will also work. Everyone has their own line of approach, I would put only the 80 back and while carefully measuring the HT, slowly power up using variac to see if HT comes up and settles at 200 - 250 volts or so. If OK , I would then use a R2k 10 watt or so resistor in place of the field winding and connect a PM speaker to the output transformer. With all the valves replaced, bring the power up again (still watching HT voltage) to see if there is any indication of audio output and possible RF noise. At least then you know there's a good chance and re-capping inevitably brings about a great improvement in overall operation. If the set is completely dead (audio wise) then obviously will have to fault-find section by section. Just my thoughts, good luck if you tackle this full on ! [/QUOTE]
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Audio and Video Talk
The Vintage Audio Section
Lafayette Superheterodyne Radio - 1935
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