I recently acquired some Tannoy parts,nameplate type 220,I tried to search infos about this amp and found none.Anyone could give me some clues about this amp?
The transformer I circled is for what pupose?transformer one side connected to the variable pot,the other side connected to the grid of VR100 tube
Thanks!
The transformer I circled is for what pupose?transformer one side connected to the variable pot,the other side connected to the grid of VR100 tube
Thanks!
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British WW2 -RAF amplifier unit , used probably in internal bomber communications .
The tube is well known to me as I owned a CR100 communications receiver and is an equivalent to the well known US tube-- 6K7G used in most UK late 30,s/40,s radio receivers if Mazda/Osram equivalents were not used .
The wiring and resistors are typical of the day then
The tube is well known to me as I owned a CR100 communications receiver and is an equivalent to the well known US tube-- 6K7G used in most UK late 30,s/40,s radio receivers if Mazda/Osram equivalents were not used .
The wiring and resistors are typical of the day then
There's said to be reference to a 'Tannoy 220 Public Address' somewhere in this 365 page PDF if you have the will to trawl though it!
https://www.blunham.com/Radar/SignalsMuseum/PDFs/RadioInstnList.pdf
https://www.blunham.com/Radar/SignalsMuseum/PDFs/RadioInstnList.pdf
Scroll down I did Galu but unfortunately couldn't find the reference BUT --many thanks for that --good detective powers !
I downloaded it recognised many communication receivers I owned at one time --and parts.
The reason I mentioned RAF and bombers is that Tannoy equipment was used in them and that a transformer coupled signal to an IF valve (high frequency ) not an audio valve would point to HF communications as bombers used non standard power supplies entailing 400Hz + and would require special interstage add-ons like that to suppress noise etc .
But if anybody knows different ?
It brought back memories of all the valve equipment relating to communications that was available post-war and I worked on .
I downloaded it recognised many communication receivers I owned at one time --and parts.
The reason I mentioned RAF and bombers is that Tannoy equipment was used in them and that a transformer coupled signal to an IF valve (high frequency ) not an audio valve would point to HF communications as bombers used non standard power supplies entailing 400Hz + and would require special interstage add-ons like that to suppress noise etc .
But if anybody knows different ?
It brought back memories of all the valve equipment relating to communications that was available post-war and I worked on .
Your WW2 bomber communications suggestion sounds highly likely - particularly in the light of your obvious knowledge of the genre - an interesting specialism! 
I'd hoped you'd find confirmation in the PDF.
I've searched from all possible angles and the guide link to that PDF was the only place I saw a mention of a Tannoy 220.
I'd hoped you'd find confirmation in the PDF.
I've searched from all possible angles and the guide link to that PDF was the only place I saw a mention of a Tannoy 220.
Interestingly, there is a connection between Singapore (puremilk's location) and Lancaster bombers!
ROYAL AIR FORCE LANCASTER BOMBERS IN SINGAPORE
Perhaps puremilk can tell us more about his acquisition!
ROYAL AIR FORCE LANCASTER BOMBERS IN SINGAPORE
Perhaps puremilk can tell us more about his acquisition!
They say in America --"this is getting weird " but I say very interesting .
I will try and check up on the Lancasters hardware inventory .
When the Leuchars air base closed down ( well only partially as it now has the army and is still used by the RAF) a large number of WW2 manuals on the Spitfire-Lancaster etc appeared in charity shops in St.Andrews , I bought a few .
I think you and I have somewhat similar thinking patterns , I am a natural investigator liking to delve deep into things ( not always a good thing to do I found out ) but cant help it .
I will try and check up on the Lancasters hardware inventory .
When the Leuchars air base closed down ( well only partially as it now has the army and is still used by the RAF) a large number of WW2 manuals on the Spitfire-Lancaster etc appeared in charity shops in St.Andrews , I bought a few .
I think you and I have somewhat similar thinking patterns , I am a natural investigator liking to delve deep into things ( not always a good thing to do I found out ) but cant help it .
Thanks all for the above helps for me to have some clues about these!
here is my drawing based on the parts wiring.
Duncan & Galu,yes you all are right that the RAF two Singapore airbase-Seletar airbase and Tengah airbase both have RAF squadron station here before and after the WWII and the two aribases are still here,those old RAF planes i reckon there were either moved back to Britain or to Australia/NZ,I aquired these parts from a friend who is a repairman.
here is my drawing based on the parts wiring.
Duncan & Galu,yes you all are right that the RAF two Singapore airbase-Seletar airbase and Tengah airbase both have RAF squadron station here before and after the WWII and the two aribases are still here,those old RAF planes i reckon there were either moved back to Britain or to Australia/NZ,I aquired these parts from a friend who is a repairman.
Small world indeed.
Avro Lancaster were used by the Argentine Air Force in the late 40´s, so much so that
Followed by a few Avro Lincoln.
Avro 694 Lincoln B-016 de la Fuerza Aerea Argentina en la V Brigada Aerea 02-09-2017 - YouTube
I bought (some 40 years ago) a radio receiver "pulled from an English bomber", go figure.
Sold it not much later because it was impossible to get parts for it.
Avro Lancaster were used by the Argentine Air Force in the late 40´s, so much so that
Followed by a few Avro Lincoln.
Avro 694 Lincoln B-016 de la Fuerza Aerea Argentina en la V Brigada Aerea 02-09-2017 - YouTube
I bought (some 40 years ago) a radio receiver "pulled from an English bomber", go figure.
Sold it not much later because it was impossible to get parts for it.
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