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 1200 ohm to 3.5 ohm.rola speaker trans
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 Return to top of page · Post #: 1 · Written at 3:15:54 PM on 17 March 2023.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 2161

I have come across quite a few NOS speaker transformers and want to know if these can be run from a 6v6 with no issues.


 
 Return to top of page · Post #: 2 · Written at 4:16:29 PM on 17 March 2023.
Robbbert's avatar
 Location: Hill Top, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 2039

Hmmm... 1200 ohm is rather low for a 6V6, I think it needs at least 5000 ohm. I would expect it to overheat with only 1200 ohm.


 
 Return to top of page · Post #: 3 · Written at 7:09:25 PM on 17 March 2023.
DangerousDave's Gravatar
 Location: Toongabbie, VIC
 Member since 1 September 2020
 Member #: 2438
 Postcount: 131

Output Coupling transformer for common emitter amp?


 
 Return to top of page · Post #: 4 · Written at 7:41:58 PM on 17 March 2023.
Fred Lever's Gravatar
 Location: Toongabbie, NSW
 Member since 19 November 2015
 Member #: 1828
 Postcount: 1267

Guys, the load reflected back to the plate is a function of the turns ratio.

ALL OTHER THINGS BEING EQUAL

We have 1200 to 3.5


if you put say a 8 ohm load you get about 8/3.5 x 1200 = 2400.
load with 16 ohm and you have some 4800 ohm.

So the trannies may be ok on a pentode or better still a triode.
Why did I shout above?
Cause I don't know, the wire size, the iron size so have no idea if they are good for 500milliwatt or 500 watt.
Don't know voltage rating either.

With a 8 ohm speaker and if they are quite oversize, may be fine for a 6V6 on 220 volt ht.
Would be settled with an actual test.

Could be better than nothing.

Fred.


 
 Return to top of page · Post #: 5 · Written at 10:27:45 PM on 17 March 2023.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 2161

Thankyou Fred that makes sense


 
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