Orange Tiny Terror Output Transformer?

[PB2]

Anyone know or have a link to the output transformer specs?
I'm guessing 6.6K CT but just wanted to confirm this.
Could not find it on the net.
Mercury Magnetics has a mod kit but does not provide specs.

My son likes this amp for a low power type.

[Minion]

I"m no expert but you can probably use a replacement from any amp that has the same type and number of output tubes ......

[PeterDupont]

The TT utilizes a five section fully filmed interleaved output transformer that is very closely balanced to primary. The EL84 output tubes are cathode biased to around 90% in the 15w position, and 96% in the 7w position. In short, the Tiny Terror is designed to produce as much gain as a four stage gain pot, but the output tubes are driven evenly all the way through. The tone control is also designed in a unique way, where the tone circuit is not on the preamp side, but actually part of the phase inverter (power amp) so the gain structure of the amp is unaffected by the tone control.
The fundamentals resembles the Vox (or Matchless, often misunderstood by called Class-A amps, but just plain cathode-bias'ed AB's running hot).
The TT tranni is not run-of-the-mill, but any 17 watt single-set El84 should do the basics.

[PB2]

Well, thanks for all that!
I'm thinking more like 8K CT for the primary after looking up the tubes again.

I'd like 4 -8 ohm taps and it looks like the Marshall 18W is best but they
tend to be pricey.

Edcor would probably be excellent but I'd have to ask if a tapped secondary
is an option.

Peter: Do you know the grade of steel used in the TT OEM transformer?

[PeterDupont]

Originally Posted by PB2

Well, thanks for all that!
I'm thinking more like 8K CT for the primary after looking up the tubes again.

I'd like 4 -8 ohm taps and it looks like the Marshall 18W is best but they
tend to be pricey.

Edcor would probably be excellent but I'd have to ask if a tapped secondary
is an option.

Peter: Do you know the grade of steel used in the TT OEM transformer?

Possibly the worst Chinese junk you could think of. In guitar-output transformators it's rather the winding that counts than the quality of the iron. Many old Marshall's got their grunt from core-saturation. The most important thing is if the primary is dimensioned for at given current.

[PB2]

The older amps did use better iron, and not "Chinese junk".
Sunn amps used the excellent Dynaco transformers.
Several companies advertise the use of M-6 core material:
EDCOR Electronics Corporation. Steel Lamination

The non-linear characteristics certainly make a difference when you
are driving the output into hard clipping.

[PB2]

Here is a low cost transformer for a Fender reissueIt is 8K to 8 ohm only but is much smaller than the Marshall 18W and probably not as good - I don't plan to use it:
Fender Output Transformer, Pro Junior

Here is a Marshall drop in replacement, it is larger and has 4,8, and 16 taps. Interesting
that it is designed for 3,7 and 15 ohms and provides an even higher 10K load for normal
loads. 8K was already high, I'd prefer something better matched:
Edit: 10K is what they claimed in the spec but I get 9K which is not too far off:
Marshall Style 18W Output Transformer 4/8/16 Ohm

This is a 15W but rated to 40 Hz so it should do 18 to 22W no problem. They don't have multitap transformers for transformers less than 25W so this 6 ohm might be a good compromise:
EDCOR Electronics Corporation. GXPP15-6-8K

Hammond 1760E or F might be good but I don't think they are the best value:
http://angela.com/hammondoutputtransformer1760e.aspx

I think this is best, 8K CT in 4 and 8 out, decent size and price:
Fender Push-Pull Princeton Reverb Style 15W Output Transformer 4/8 Ohm