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Rusty transformer metallaminations
Rusty transformer metallaminations
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Old 12th November 2018, 09:15 PM   #11
JMFahey is offline JMFahey  Argentina
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Muriatic acid must not be in the same room as Electronics equipment, even less *applied* to it.

You GUARANTEE rapid rusting, corrosion and destruction.

Leave Muriatic acid to tin bucket makers, coffin makers, etc.

A little rust will not hurt transformers, clorhydric/muriatic acid vapours corrode averything within reach.
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
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Old 13th November 2018, 01:15 AM   #12
alexberg is offline alexberg
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There is peculiar problem with rust, it occupies more volume than iron.
If you are not afraid I said.
Every freaking chromium coated knob and every piece of aluminium amplifier case and/or hetsink was soaked in acid for quite a time.
Adios, amigos.
P.S. If you do not know how to, please do not look for excuses.
P.P.S. H2SO4 is really hard to get rid of - it's not volatile, while HCl is a gas, soluble in water.
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Old 14th November 2018, 10:27 AM   #13
donaldducks is offline donaldducks
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Default More pictures from the guts of an es200

Hello, today i dissasembled the electronics of one audiostatic es200. Here are some pictures.

The schematic starts with a 68 microfarad elco and a resistor of 3.3 ohms. This resistor isnt burned so the previous owner didnt play to loud.

For now i have to follow the traces and make a schematic

Gr edwin
Attached Images
File Type: jpg 99A2ED97-0E3D-4086-A53A-3F44572CE85E.jpg (591.4 KB, 90 views)
File Type: jpg E6F4C924-456D-4706-8AC9-0D96C522768E.jpg (561.9 KB, 93 views)
File Type: jpg 8E4740B3-5F75-486D-8465-D4791CA7B0A0.jpg (580.1 KB, 91 views)
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Old 16th November 2018, 12:12 AM   #14
bolserst is offline bolserst  United States
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Thanks for posting the pictures.
I can help out with the schematic if you post a picture showing the complete back of the printed circuit board. The first image was close, but missing the portion where most of the crossover parts are located. It would be nice to put together the schematic for your 200RS which looks like it has the 3 position switches for adjusting bass and treble like the 300RS.

Attached also is a schematic I started for a ES-300 that somebody had posted board pictures for. I still need to get confirmation on the resistor and capacitor values though.
Pics posted here: Do different components in the filter of an ESL actually effect the sound?
Attached Images
File Type: png ES200RS_PCB_partial.png (662.2 KB, 60 views)
File Type: jpg es_300rs_01.jpg (235.4 KB, 57 views)
File Type: png ES300_Interface_Circuit.png (30.1 KB, 37 views)
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Old 16th November 2018, 04:40 PM   #15
donaldducks is offline donaldducks
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Default Es200 schematic

Thank you bolserts for your help. Here are pictures from the boards. Front and back. But what i cant figure out. There is one solderpoint on the bottum left corner of the board that doesnt seem to have a connection with any other point. It is a transformer connection from the mirrordrive transformer on the bottum.

The hights have four 6.8 condensators in parallel

And see the pictures for the resistor values
Perhaps you knowits purpose?

Greetings edwin

Last edited by donaldducks; 16th November 2018 at 04:46 PM. Reason: Forgot a passage
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Old 16th November 2018, 11:40 PM   #16
bolserst is offline bolserst  United States
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Thanks for the pics! Schematic attached.

The unconnected terminal of the mirror-drive transformer is just an unused tap.
Iím not sure if it was to allow use of one mirror-drive transformer with multiple models that required different ratios, or if it had at one time been used in a configuration where the tap was selected with a switch to change the bass boost amount. All circuits I have seen only used 3 connects to the mirror-drive transformer.
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File Type: png ES200RS_Interface_Schematic.png (59.5 KB, 21 views)
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Old 17th November 2018, 05:10 AM   #17
donaldducks is offline donaldducks
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Thanks for the schematic. This is going to be a nice journey and project!

I have also succesfully finished two esh 50 audiostatics. One pair is fully assembled an for one pair i only finished the panels. And i noticed that the dimensions from an esh50 panel is the same as of an es200 panel. But if you really look closer.

The ds spacing is a little bigger. So no fast journey. And no fast panel swapping.

But that should have been obvious because of the mirrordrive and the need of more mylar movement.
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