How good is the Tamura TamRadio iron?

[NiFe]

Seems the last chapter in this Sony 5K Tamradio cooked output transformer tear down .
3P/2S sections layering .
The 8 ohm secondaries are not multifilar wound , which would account for the HF roll off at 18kHz according to the Sony manual.
IMHO what are most likely Permalloy core's account for the lifelike sound qualities of these little units rather that anything particularly special about the winding technique of Tamradio / Tamura here .
As I have a few of these , am looking to rewind a pair with 4P/5S sections with no 600 ohm tap , mutlifilar this time .
Will also look to blend the original cores 50/50 with M6 Silicon steel to get better bass response .
If you were looking for a 5K full range transformer Lundahl do an excellent one
https://www.lundahltransformers.com/wp-content/uploads/datasheets/1663.pdf

 

[joe83]

This is going to be my last attempt at trying to find a use for a pair of there output transformers...

Not sure I have this correct; if I were to use the 8r taps on my 16r speakers the primary’s would work out to be 2.5k rather than 5k? I think doing this would be problematic in other ways, the 5 W they are rated for would be reduced I think?

 

[shoshin]

The primary load your tube “sees” will be 10k. If your speakers are nominally 2x your taps, the primary impedance will also be nominally doubled.

 

[joe83]

The primary load your tube “sees” will be 10k. If your speakers are nominally 2x your taps, the primary impedance will also be nominally doubled.

Ah thanks, I got it the wrong way around.

 

[shoshin]

Easily confused. We could think of it as "if speakers R is higher, primary load is higher."

 

[paul_b]

What's the primary DCR?

 

[NiFe]

Will go measure them.

I think I will make a number of these for 45 and 2A3 to start with .
The 2A3 will require approx 60mm lamination thickness .
They will be %50 initially and about 1/2 the price of the guy who makes them stateside .

 

[J. Frum]

Will go measure them.

I think I will make a number of these for 45 and 2A3 to start with .
The 2A3 will require approx 60mm lamination thickness .
They will be %50 initially and about 1/2 the price of the guy who makes them stateside .

Why not start a new thread to shill these?

 

[Thermionics]

Why not start a new thread to shill these?

Yeah, if these are going to be sold, then this conversation should be forked off into The Emporium to not incur the wrath of the PM.

 

[NiFe]

Yes i will head of to the emporium if this venture takes off , thanks for the heads up,

 

[Thermionics]

Yes i will head of to the emporium if this venture takes off , thanks for the heads up,

Of course - gotta keep the PM happy.