Jencen - Please don't call me Derg20h ago

On today's episode of #JencenMakes

This fuckin' thing!
A Bush SUG23 Superheterodyne gramophone receiver Circa late 40's early 50's.

Am not gonna go into how a SuperHet works - @TechConnectify did a fantastic runthrough of that here! https://www.youtube.com/watch?v=hz_mMLhUinw

This is for my FoxShape to have some tunes in his room whilst maintaining his late 1800's aesthetic ^_~

Sadly something has "Done a poo" all over the inside of the cabinet.

Powering up you get the heaters on the valves but no hum or noise of any kind implying the HT has gone somewhere!
Dunno where. Some sort of holiday I guess!

Sooooo....... I'm gonna annoy a few people by ripping out its guts and installing some modern gear.
Am not going to bin the tuner/amp chassis as it's all valve based and interesting/important to the museum story of making wiggles. And at some point I'll restore it and do a writeup/video about it.

For now though. Follow this thread for more info and blasphemy!!!

Don't worry. the case won't be harmed!

Show threadJencen - Please don't call me Derg

The tuner/Amp chassis is entirely removable making servicing a breeze!

To the left is the mains transformer that provides 6.3v for the heaters, and "Fucking OW!" levels of voltage for the HT side of the tubes.

Next to that are the EZ40 rectifier to make the DC, and EL41 beam tetrodes being used as the push pull for the speaker, and the EBC41 Double diode triode (try saying THAT 5 times fast!) that's used as the phase inverter for the pull stage.
The guy at the front is another EBC41 which is the diode signal detector.

The final 2 valves are the ECH42 and EF41 that do the frequency changing and amplification respectively.

Then on the right are the plates used for the tuning itself

Mar 28 at 12:30pmWeb
Show threadJencen - Please don't call me Derg20h ago

I have found the source of the shmoo!

Looks like the input transformer has gotten somewhat warm and dribbled out a mysterious black goo! Which is somewhat offensive..... /I/ am meant to be the Mysterious black Goo around here!!!

Anyway. The underside is somewhat messy. Being used to Mullard and Avo test equipment and Compton amplifiers (Which are a work of art!) This looks like someone was eating spaghetti and sneezed!...... Then set fire to it!

My job today is to hijack the power switch and internal illumination lines so that I can keep this thing as stock as possible.

I'm removing the internal speaker and associated audio transformer that has also "shat out its guts" and put in a modern bluetooth amplifier and pair of speakers.

Show threadJencen - Please don't call me Derg17h ago

Testing the bluetooth amplifier and a couple sets of speakers with my customary track "Hearth's Shadow" from the outer wilds "The lost reels" soundtrack.

This one is particularly good as it starts with a nice acoustic guitar to pick up the mids and highs.... then slowly transitions into a /really/ complex descending phased bass drone with multiple frequencies going on.

If anything is going to destroy a set of speakers or an amplifier... it's /that/ part

One set of speakers couldn't do the bass despite moving the driver as hard as it could.....

The JBLs have just hit the 3A current limit on the PSU I'm using >.>
Maaaaay not be able to use those with this amplifier..... It smells..... warm >.>

They sound fucking epic though >.>

Show threadJencen - Please don't call me Derg14h ago

Rewiring the lights. Originally off the 6.3v for the valve filaments. I'm gonna be running it on 24V for the amp. So 2 12v in series should work.

Replacing a load of old rubber wires too. Because it's crumbling o.<

Show threadJencen - Please don't call me Derg13h ago

And with that. Tis done!

Original power switch controls the power. Tuning indicator still moves the needle.
Little Bluetooth amp sits on a custom plate
Speakers are bolted to a wooden panel ready to be sorted properly!

Love having the laser working again >.>
Oh I need a front panel for a little amplifier?
Measure measure. Cutty cut! Done! ^_^

Show threadDeltaWye10h ago
@Jencen That looks incredible Jencen!