Teac AS-200S find and restoration

[quadmatrix82]

Hi all, I thought I’d start this thread to share with you a pretty rare amp I just got a Teac AS-200S.
Hoping this can be a source of info for any other owners but also share what the amplifier is about.

Teac made some really nice gear in its hey day - I’m a big fan of the AS-100 integrated amp.

I’ve been talking to fellow member @Numome who also owns one of these amps from new. He tells me these were made only for around 3 months so a lot less common than the already relatively scarce AS-200.

I’ll start to refurb this and share photos along the way.

Any other Teac AS-200S owners out there? Would be great to hear from you and your experiences with this amp!

 

[quadmatrix82]

Few photos of the internals the switch gear feels very nice as good as any Pioneer or Sansui of the period.
The wiring is very neat Plenty of cable ties keep it clean - clearly Teac put care into the layout and design

 

[quadmatrix82]

Control amp board after a recap - I used Elna Simmic caps here

 

[quadmatrix82]

Pre amp board after a recap

 

[quadmatrix82]

The amp looks totally original inside and out and never serviced before - dust and grim often builds up on the pot shafts I normally clean them with isopropyl alcohol it improves the feel of the pot and I’ll deoxit them for static free operation

 

[Numone]

Don’t lose the tiny grub screws on the knobs Andy!

 

[Numone]

And give the pots a squirt of Servicesol or Deoxit after you’ve cleaned them with ISO.

 

[audiojones]

Neat! TEAC put great care into the layout and design of everything they made. What a great find!

 

[quadmatrix82]

Some more progress believe this is part of the power supply. Used nice Vishay axial capacitor here

 

[quadmatrix82]

Noticed the contacts on the switches got some carbon build up not easy to clean but tried gently to remove as much as I could - not sure how much it makes a difference but looks betters - before and after I did this for all the rotary switches

 

[quadmatrix82]

Phono board before and after - any thoughts on the towa caps? Should they be changed?

 

[audiojones]

Just curious what kind of capacitors you are selecting for the various duties called for in the circuits. Are you using UKL type caps in the signal path, films for small UF coupling duty, general purpose for power supply, filtering etc? Everybody has their own way of doing things, just wondering how you’re going about it.

 

[Oldsansui441]

Nice work quadmatrix82, looks great. That is a very nice TEAC and well built by the looks of it. I don't remember seeing those Towa caps before on any gear l have worked on, l assume they are input or output signal coupling caps. If in doubt, a Wima MKS2 or Kemet R82 would do nicely.

 

[Moving Ahead]

Any idea as to the date of manufacture?
I see a relay, what circuit topography is this? ie what are the outputs part number.
Teac was particular about small signal gain, you can see the Y grade printed on top of transistor case.
Nice unit don't see at all.

 

[quadmatrix82]

Just curious what kind of capacitors you are selecting for the various duties called for in the circuits. Are you using UKL type caps in the signal path, films for small UF coupling duty, general purpose for power supply, filtering etc? Everybody has their own way of doing things, just wondering how you’re going about it.

i used mostly Elna Simmic caps, Teac used the same type of electrolytic cap throughout so without a service manual to check any type of preferred caps I thought Elna Simmic would suffice - plus I had heaps on hand so nice to use up the stock I had on hand. In the power supply I used the Vishay high temp capacitor

 

[quadmatrix82]

Nice work quadmatrix82, looks great. That is a very nice TEAC and well built by the looks of it. I don't remember seeing those Towa caps before on any gear l have worked on, l assume they are input or output signal coupling caps. If in doubt, a Wima MKS2 or Kemet R82 would do nicely.

cheers thanks for the tip I have left them in for now but might change them for films once all done and working ok!

 

[quadmatrix82]

Any idea as to the date of manufacture?
I see a relay, what circuit topography is this? ie what are the outputs part number.
Teac was particular about small signal gain, you can see the Y grade printed on top of transistor case.
Nice unit don't see at all.

this was made in 1970, the S model was only released for 3 months so a very rare unit - this does have a relay and is a dc integrated amplifier. Here’s a photo of the outputs.
totally agree that Teac were fussy on transistors I have kept them all original for now to protect the integrity of the amp how Teac would like it!

 

[quadmatrix82]

Next was onto the output power amplifier modules. Here is a before and after of them. The heat sinks are really solid. The amp really oozes quality! These are difficult to access without removing the mounting brackets to the chassis - this allows you to feed the board below the cavity for ease of access.

 

[quadmatrix82]

So onto the next power module, I said earlier this was totally original but open inspection it looks like someone attempted some poor soldering on two transistors on this power module - the transistors are still the original ones - they test well when I measured them with the multi meter however unfortunately the tracks have lifted in some spots from the previous repair. I used solder braid gently to remove the old solder and bent the legs down to the track to give better strength to the track before resoldering them. Also recapped and cleaned the board looks much better now

 

[quadmatrix82]

Here’s all the old electrolytics - most of them were leaking so glad I changed them - I have kept the original power filter capacitors in place for now but may change them later.