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Shew... Those look very much like Radford monoblocks! Just not sure of the model, they not STA, could be K series or MA series. Those are very likely Partridge transformers. The valve line up is also the Radford set up EF86/ECF82/EL34. Visual design also very much like Radfords other models...

"Children of Sugarcane" by Joanne Joseph.

That green capacitor is likely part of the output stage stability circuit (a Zobel-like configuration) , possibly working with those ceramic power resistors grounded at the speaker connectors. A partly damaged output transistor stage is what I suspect at this point as it will shift your measured...

Also, check the main rectifier diodes which feed the filter capacitors. A bad diode could also cause these symptoms.

Possibly the filter capacitors need replacement.

Isophon prepared baffle. Nice, has a rich sound.

Another pic of my amp.

Pic of the back where speaker outputs are, and associated switch (back left). Clean that switch and those speaker terminals as well. I recall there being a headphones socket near there as well... clean that socket and it's built in switch / disconnect mechanism (if it has one). Was interesting...

Ok, so you have some (amplifier?) experience, that helps. Since you are leaning towards a problem with one of the power amp boards, fortunately they are separate boards for left and right channels... The easiest start in localising further is to compare resistance values at various points across...

You may need the help of an electronics technician who knows amplifier repair. Where are you located?... we have many experienced repair techs on this forum who may be able to assist, possibly someone closer to your area.. If you have the skills/knowledge and some basic tools (solder iron...

As a first resort, clean all switches and potentiometers with a suitable switch cleaner spray (various on the market, forumites may advise, or search the forum for threads on the products to use). It seems you swopped red connectors (from the preamp?) between the amp boards and the initially...

Clearly, the impact to us (part of the title) is that these topics upset this forum, forumites start verbally attacking each other, there's no value in discussion as open-mindedness is lacking and bias seems to rule each participant to the extent that participation becomes toxic in itself...

You could work around a simpler circuit for this. Also consider using a solid state relay, they work well. I would look at a prototype as follows. The 10k resistor provides a tiny static load and also serves as a discharge path when powering down. The electrolytic capacitor smooths the switching...

A few functions occur there. Switch-on delay (speaker protection/disconnect for a few seconds after power up) and speaker disconnect in the case of excessive DC offset. I have a similar intermittent/occasional issue with an amplifier channel and my plan is to set up a DC milli-voltmeter to...

Sounds like leaky semiconductors, maybe some bad capacitors also possible here. If you have the skills, study the circuit, pull the small sig BJTs for junction resistance, diode tests and hfe testing. Check for dry joints. Probably an initial test, since you have powered it up already would be...

@ScottulusMaximus we have no immediate intention of closing your account/profile as your customers need this space as a resource towards resolve.

You have to advertise it in the for sale section. They can range anywhere from R1500 - R3000 or so depending on condition, remote control, current market / buyer interest.

This is a multi-faceted collective of "forums" ranging widely from general life to food, technology and accommodates personal views and International (only) world news debate, which is moderated and reported on by forumites should something be out of order. Having said that, our anchor is and...

Just a general notice of awareness, this is a controversial topic, please report any content that's out of order. Participate thoughtfully, topic-specific and maintain respect. This topic/thread is appropriately located in the "Open Talk" forum. If your interest resides exclusively in specific...

A nice thread (link below) on the Supersonic One Eleven, and it's @G Man grand dad who designed and built products for Supersonic. Still have a One Eleven set packed away. https://www.avforums.co.za/threads/supersonic-one-eleven.71586/