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across the bench: an electronic menagerie of diagnostic oddities plus photos and design analysis

Ocelot Update later, spots unsubject to change….
My very best to YOU.
Keep Rolling like you do..

Celadon sez YOU ROCK!
 
Rockyhill said:
My 500B looks entirely different.
Click to expand...
excellent observation, it appears to be a 400 now that i am somewhat more consciously aware of my recent photo binge.

would have been nice if i had taken a photo of the model number on the chassis. or done 30 seconds more visual awareness of an obvious error. must be a holiday or something...

Fisher 400 | Classic Receivers

The Fisher 400 is a beautiful receiver that was built with attention to detail and performance.
classicreceivers.com classicreceivers.com
 
sae-7125 said:
excellent observation, it appears to be a 400 now that i am somewhat more consciously aware of my recent photo binge.

would have been nice if i had taken a photo of the model number on the chassis. or done 30 seconds more visual awareness of an obvious error. must be a holiday or something...

Fisher 400 | Classic Receivers

The Fisher 400 is a beautiful receiver that was built with attention to detail and performance.
classicreceivers.com classicreceivers.com
Click to expand...
I’m sure it sounds similarly delightful.
 
technics sa700 - 4.jpg
this one needed lots of spray and lots of exercise mechanically before the preamp section decided to let anything through.

technics sa700 - 5.jpg
bit of a mess to disassemble, doing a recap has some difficult areas to contend with
 
technics sa700 - 6.jpg
also output relay was mechanically weak so removing its cover for mechanical recalibration was needed so that a finger tap to the cover doesnt cause signal loss. bending toggle contacts slightly towards destination contacts helps plus the usual cleaning of both metal pad surfaces.

been down this road a few times.
 
technics sa700 - 8.jpg
usual idle numbers inspection for the sa-700, especially after servicing the relay and its importance for doing an accurate bias adjustment

technics sa700 - 9.jpg
thermals to see the high stress areas and what caps are getting cooked over time. also txf temp after some dynamic exercising.
 
yam pair.jpg
nice pair of yamaha components, tuner and integrated amp. basic testing and cleaning before they are out in the pending new showroom.
 
diy mod red-1.jpg
the modified little red nobsound amp is still being used. better performance since it can breath now, higher wattage output with better thermal control. two pair of bench speakers connected 2-3r dcr.
 

variable capacitor volume control

I've seen it done in REALLY old radios (never looked at how the circuit worked though). I was wondering if any of you Circuit Geniuses knew how they did it and if it could be applied to a tube stereo amp. I've tried resistive and inductive so now I want to try capacitive.
www.diyaudio.com www.diyaudio.com
perhaps some ideas for variable capacitor volume control, even though it will have a xover effect until 20khz and higher.

perhaps a low resistance bandpass xover with a parallel switching cap. need to run some sims and z-calcs.
 
www.audiosciencereview.com

Review and Measurements of Schiit Sys Passive Pre-amp/Switcher

This is a measurement and review of the Schiit Sys switcher and passive pre-amp. It retails for just $49 plus shipping which is reasonable. The unit is on loan from a member so not new. I will do a teardown later but for now, there are just two inputs, one output, and a volume control in...
www.audiosciencereview.com www.audiosciencereview.com
cost effective passive preamp, although around 70usd on amzn, factory 49usd.

jdslabs.com

OL Switcher _ Shop JDS LABS

OL Switcher is the solution to your input/output woes, enabling you to route your audio where needed, without fumbling with cables. OL Switcher is a 2 input, 2 output, passively attenuating preamp. Connect a DAC, connect a DAP, connect a headphone amp, and your speaker system. ATTENTION...
jdslabs.com jdslabs.com
free custom engraving on some of the jds gear, a noteworthy option.
 
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