Vintage Tannoy - Not even Tannoy Knows

It is odd how many companies do not bother to keep any documentation of discontinued models.
Things like crossovers, model designations, speaker parameters..
Really sort of sad so many companies view it all as throw away..

And the folks who know, retire and just disappear.
I remember I wanted a schematic for the crossover for my Infinity RSIIa after I had them about ten years.. It was very hard to get one, and I had to make a lot of phone calls to various Infinity offices. But then someone in Infinity's testing area found a copy of a copy of a copy of a copy of the crossover and sent it to me. It was barely legible, but I was able to use it. Now, nothing. Unless someone has a copy somewhere, they are lost forever.
Way too many things like that.

For more current stuff the internet seems to be getting stuff which one can locate info on. But those older items, it will take a labor of love on some mavens part to bring that info to light.

Looks like you can download brochures for the amp and preamp (but not the integrated amp) by registering at The Audio Circuit.

It all appears to be from the mid-to-late 1950's, based in part on the inclusion of "RIAA" in the phono equalization selections.

These pieces are undoubtedly quite rare, at least outside of England where they were manufactured. Tannoy is known mainly for their speakers and speaker drivers. Many of their vintage speakers and drivers are quite valuable, including some from that period.

In your other recent thread you were asking about value. It's anyone's guess as to what they would sell for. My guess would be a few hundred dollars for each piece, or perhaps somewhat more for the power amps (I see in your other recent thread that you have two of them; a pair will be worth significantly more than twice the value of a single, since it can be used for stereo).

BTW, if you are tempted to try them out using a 120V to 240V step-up transformer, as you may realize the first time that is done the voltage should be brought up very slowly (over a period of many hours), using a variac or other variable ac power supply. During that process check that the power transformer isn't overheating. And before doing any of that, all of the electrolytic capacitors should probably be replaced. Finally, as with any tube power amp or integrated amp that has an output transformer, the power amp and integrated amp should not be operated without a speaker or equivalent load connected.

Regards,
-- Al