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Old 9th April 2011, 07:06 PM   #1
PB2 is offline PB2  United States
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Default Orange Tiny Terror Output Transformer?

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.
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Old 9th April 2011, 09:41 PM   #2
Minion is offline Minion  Canada
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I"m no expert but you can probably use a replacement from any amp that has the same type and number of output tubes ......
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Old 9th April 2011, 09:53 PM   #3
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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.
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Old 9th April 2011, 09:58 PM   #4
PB2 is offline PB2  United States
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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?
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Last edited by PB2; 9th April 2011 at 10:01 PM.
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Old 9th April 2011, 10:14 PM   #5
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Quote:
Originally Posted by PB2 View Post
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.
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Old 9th April 2011, 11:52 PM   #6
PB2 is offline PB2  United States
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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.
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Old 11th April 2011, 09:25 PM   #7
PB2 is offline PB2  United States
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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
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Last edited by PB2; 11th April 2011 at 09:33 PM.
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Old 16th October 2012, 01:16 PM   #8
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Hey! The output transformer on my TT broke down. I'm searching for a bigger and more reliable one to replace it with.
Would any of these do the trick? Which one do you recommend?
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Old 30th October 2012, 03:00 PM   #9
Struth is offline Struth  Canada
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Hi Guys

Check out the Hammond 1700-series replacement PTs/OTs for guitar amps. Hammond's site has full specs for every part. You can buy them from CE Distribution in the US, and from Hammond dealers around the world.

Great value for the money.

If you wanted to go crazy hi-fi OT-wise, check out the Hammond 1560E which they rate to 70Hz but it actually goes to 7Hz - yes 7Hz!. This was originally a Thordarson design. The 1650E is 15Wrms full audio bandwidth, 8k-aa with UL taps, 4,8,16 taps. I can't vouch for there being enough space on the Vox chassis for this OT.

Our site has full (expanded) specs for the Hammond 1650-series OTs, 200/300-series PTs, and shows how to match PTs to OTs.

Mercury Magnetics OTs are over-hyped junk. I've heard more reports than I can remember from techs installing MM parts due to customer requests only to further replace the MM part with a better-sounding generic replacement.

Have fun
Kevin O'Connor
londonpower.com
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Old 30th October 2012, 09:35 PM   #10
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Disclaimer: I'm just a hack, certainly not an expert. The guy above is.

Edcor doesn't make a GXPP-line tranny under 25 watts with multiple output taps, but they do in the CXPP line.

So you burned out the original, and want something that won't blow again, but want to keep the tranny's input impedance low and drive it hard, high A/B bias, and need screen taps? More money, but perhaps you could look at transformers rated more than the amp's output power, like the 21-watt Edcor CXPP21-MS-8.6K into 4,8,16 speaker for $56.52 or the 25-watt CXPP25-MS-8K into 4,8,16 speaker for the same $56.52. Wouldn't a higher impedance make less power but be more reliable? There's a huge variation in the power from EL84's, like the Peavey Classic 30 and classic 50 both use 4 EL84's, but one has a lot more output than the other. Good luck.
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