TRIO Kenwood SG-402 RF Signal Generator 100kHz - 30MHz 1974 teardown

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100kHz to 30MHz in 6 ranges with a little bit overlab, it is AM modulation,
internal external or CW, uses 2.5W from mains supply, variable ALPS capacitor got date code 1974, have you seen all my other TRIO units,
check out my video list.
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#vintage
#repair
#teardown
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I use auto generated subs, i am sorry there are a few spelling errors,
maybe one day they can do it better..
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23 июн 2024

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Комментарии : 11

@paulstubbs7678 9 дней назад

Interesting little oscillator, Trio also used that case design for an oscilloscope, so maybe there is a range of gear in like boxes. I'm guessing the power transformer is on a raised section as they were concerned that the mounting bolts were extending too low, so they could either do this, or fit taller feet, however taller feet would make this unit look out of place when set next to other like cased instruments.

@JWE396 8 дней назад

Love to own that device, I could really use that test equipment for my bench. Great looking meter my friend. Keep up with the awesome videos. God Bless 73's Hope you having a Great week. 😁

@marcseclecticstuff9497 9 дней назад

The pedestal the transformer is mounted on is simply for mechanical clearance on the bottom of the chassis. Producing that feature isn't very difficult, a set of dies are used on the top and bottom and it's punched. There might be a series of a couple of dies to form it in steps, reducing stress in the steel as it's formed. I've seen the technique used quite a bit over the years. The knob turns backwards because they didn't want to spend the extra few cents to put an intermediate roller between the knob and the tuning cap shaft to correct the rotation.

@TeardownOZ2CPU 9 дней назад

i think this punching is super interesting, since the lifted part needs more length material, to get that, it mush streech the material using very high force, the hold bottom plate straight force at the same time, must be crasy high

@marcseclecticstuff9497 9 дней назад

@@TeardownOZ2CPU The dies keep everything perfectly straight. Imagine the top die and bottom die are the same shape as the 'strap' less the thickness of the metal it's made of so it's squeezed perfectly between the 2 dies. Because it does have to stretch the 'sides' quite a bit, it may have been done in 2 steps, I'm not that familiar with punch press operations. I know the old school ventilation louvers that used to be common on stamped equipment cabinets were stamped with a single die set so you can displace a fair bit of metal before it starts to tear. I love the simplicity of this old equipment. You can just look at it and figure out roughly how it works.

@splitprissm9339 7 дней назад

Sine-ish waveforms from that type of generator? I am confused :)

@oldblokeh 10 дней назад

Alternative theory for transformer mounting... They wanted the transformer to be removable, i.e. screw mounted. The screws have to be undone from inside the unit because you don't want idiots undoing them from the bottom and the transformer dropping off and breaking things. Self tapping screws are best, otherwise nuts can be undone from underneath. You don't want the points of the screws sticking out beyond the bass plate. Solution? Bend the chassis. Incidentally, Trio is normally pronounced tree-oh

@TeardownOZ2CPU 10 дней назад

thanks a lot for your comments, it sure look like an odd way mount the transformator, there must be a good and smart idea behind it, you could also be right :-)

@charlesdorval394 10 дней назад

Makes sense to me! I'm thinking they mounted the transformer that close to the PCB because they needed the metal near the edge to make that bend properly maybe?

@Sine1040 9 дней назад

Yep, that was my idea as well, no screws sticking out to scratch your bench. They need to press with a lot of force anyway to punch the holes. That is probably done in a single stamping operation.