across the bench [season-2] the electron strikes back

vincent sv236mk - 5.jpg
lighting effect is functional, metal remote had battery issues either slow drainage/short somewhere or something.

vincent sv236mk - 3.jpg
healthy sized speaker terminals
 
vincent sv236mk - 4.jpg
multiple chamber interior, not much in the way of board ventilation

vincent sv236mk - 8.jpg
lots of zip-ties for the low amount of wiring. look at all those "parallel" conductors and the potential for noise propagation. when the system is active and at idle the noise floor is more than noticeable, might be aged glassware though. further testing is need.

a few vent holes in the front board for the tubes but not much else.
 
vincent sv236mk - 6.jpg
some caps close to the heated glassware

vincent sv236mk - 7.jpg
idle consumption is definitely on the high side. should have taken some thermals after 1 hour of idling, maybe next time.

that should do it for the cliffhangers, pioneer with issues up next.
 
pioneer sx3800 - 4.jpg
the usual suspects when quoting one of these

pioneer sx3800 - 5.jpg
lurking under the boards and heat sink is a predictable dysfunction that can cause quite a mess
 
pioneer sx3800 - 6.jpg
this is becoming a common sight when opening one of these receivers, magnet wire +/- electrical tape being used as structural support or enhancement.

pioneer sx3800 - 7.jpg
also a familiar sight, an nte part number (not a good thing)
 
pioneer sx3800 - 8.jpg
somebody must have lots of time on their hands to carefully wind magnet wire around the connector and not have it look like a slop job. have seen this on a few other 3800/3900 receivers. not an easy task when the self destructing connector is already delicate.

pioneer sx3800 - 9.jpg
what do you suppose happens when collector meets base, at any time due to heat and weak plastic.

this system has a few other issues and obviously needs a full recap and non-nte outputs will need to be sourced and... all the output transistor connectors will need an update or upgrade to something more stable/reliable.

 
myryad stack - 1.jpg
a stack of myryad, integrated amp plus tuner and disc

MI120 and MI240 Amplifiers

MI120 and MI240 Amplifiers The MI120 is an exquisitely-designed […]
myryad.co.uk

myryad stack - 2.jpg
relatively clean and simple design, just verifying functionality before it hits the showroom floor

stereonomono.blogspot.com

Myryad MI-120 amplifier

Myryad, integrated stereo amplifier
stereonomono.blogspot.com stereonomono.blogspot.com
*output wattage listed not accurate
 
I might be tempted to fab up a little PCB to make for easy connection between the output device and the wiring if a new connector with appropriate spacing isn't available.
 
myryad stack - 7.jpg
lights are on and somebody is definitely home

myryad stack - 5.jpg
disc tray is operational, not slow nor in need of adjustment
 
myryad stack - 6.jpg
all three up and running, need to do an idle measurement

myryad stack - 8.jpg
not bad for all three, vintage receivers idle between 65-100w by themselves.
 
myryad stack - 10.jpg
in regards to ventilation, interesting to see the added protective mesh. also note the heat sink components on the board and their distance from thermally sensitive components, yeah the electrolytics.

myryad stack - 12.jpg
heat sink vent slightly on the small side but it should be sufficient
 
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