Hey Tony. Want to let you know that I'm loving this series on this pioneer receiver. And I also wanted to expand on your comment about replacing the filter capacitors. Your statement about wanting this receiver to be working 30 or 40 years from now is exactly my thoughts on why I would always replace the filter capacitors in every one of my restoration projects. Even if the capacitor tests okay as far as capacitance and ESR, I will always replace filter capacitors. If you have a leakage tester, you will find that almost every one of these old capacitors are leaking more than a new one. Leakage leads to higher heat within the capacitor and accelerated aging and failure. Even if a capacitor tests within spec in as far as capacitance and ESR is concerned, they will not last. Given that you're going through a restoration on any piece of old equipment, I believe it's money well spent to replace the filter caps if you are replacing all the other electrolytics. And I know it's more of an esoteric, audiophilic aspect, but raising the capacitance of your main filter capacitors will ultimately lead to better sound, especially in the lower frequencies on speakers that are difficult to drive and have low equivalent resistance especially in a lower frequencies. And by equivalent resistance, I mean reactive resistance due to crossover capacitive and inductive reactance, not just pure resistance.
Changing the filter caps made a huge difference in my 1280! People that say to leave them are nuts. Bass was weak and muddy on old caps. Nice and clean with the new caps. Dial lamps don’t dim at all when driven either.
Congrats on getting a Jonard wire unwrapping tool to get off of the wire unwrapping struggle bus. I always cringe when I see people prying apart a wire wrap with pliers when a proper tool is available, or one can be made, which I have an example of. Having had to do wire wrapping on a production level, and also having to take apart and rework them, having the proper tools for that job is a huge time saver.
Those larger caps should be fine. They used the same value in the SX1250. Moving to a 15000uf on the X80 receiver was likely just a cost-cutting measure.
Nice Tony, taking care of ur audio. Yup even in antique radios they use caps and a filter choke or two. I have the SX850 and SX950 and very plsd with both. I Bring them in for a yearly cleaning of pots. And whatever the tech thinks. I think being in a tobacco free zone is a big help.
im getting ready to overhaul a marantz 140 i have all the parts in my stock but the main filter really wish they still had dual caps available it has lost capacitance and esr so it needs it . i still havent tackled my 1280 but this series is giving me insparation to get on it
14:43 22000 mF would deliver 275J of energy, however 22000μF is three orders of magnitude less so would deliver 0.275J of energy since V = q/C and E = ∫V.dq = ∫q/C.dq = q^2C/2 = V^2C/2 where V is in Volts, C is in Farads, q in Coulombs and E in Joules.
Is it OK to install these screw terminal caps with the terminals and vent on the bottom? I have heard you always want the vent on these types of caps pointing up. I’d like to get your thoughts on this. I’m going to be replacing some 22,000 uF caps in a Pioneer SX-950 and I need to decide on the orientation Thanks
It won't hurt for them to face down. You just have to make sure they aren't being blocked by being right up against a circuit board or chassis. The idea is if thee cap vents, it can release the pressure through the vent plug located between the terminals of the cap. On other caps, the top of the capacitor case is scored in a + pattern, which will allow it to pop open to vent. again, it doesn't matter which way it faces, just so long as it isn't being blocked by something pushing directly against it.
Use an MJE15032G. It is in a TO-220 package and the outer leads will line up with the pins and the tab will line up with one of the mounting holes for the collector connection.
