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Don't know. Just remember from 18watt your pic of the amp. Maybe a different angle? I remember the original speaker you had reconed and a pic of that. Maybe that was all I saw?

scans up

Ah, you were thinking about the Mullard 5-10!
I've built a 3-3 and a 5-10. Only the 5-20 for a full set....

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opps,See I guess I never saw the 3 - 3. you did a great job.

Found a Mullard 3-3 link http://vintageradio.me.uk/amplifier/mullard33.htm

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Thanks Jac!
The 3-3 is an interesting design, which runs the EF86 at starvation voltage, and couples it directly to the EL84 grid.
I used VVT and Sowter transformers, which are audiphool spec, and far too expensive. In retrospect I would use cheaper iron, but still overspec the OT Hifi style, as I believe (rightly or wrongly!) that this helped produce a lovely warmth to the clean sound.
I went to a lot of trouble to get an EZ80, but now I know that the more common EZ81 would serve very well. Or even an SS rect, as with class A there won't be much sag anyway.
Also, I'd use a much bigger chassis, and incorporate the tone controls, volume and switches inside. Basically do a complete new layout, guitar amp style, and forget the Mullard layout.
The only changes I made to the circuit was to reduce the NFB which allowed more distortion.
This has got me all fired up to make another one of these now!

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I'm thinking about it too. Going to search for some iron.

But what about the AC4? EF86 to EL84 with EZ80 rectifier?

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Nominally a very similar amp. I'd have to look at the schematic to see how similar. Don't think it does the starvation voltage thing though.
Build one of each and compare!

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I compared them. Quite different. After the reading the 3-3 stuff from Mullard, it would seem a way too clean amp for guitar. What with feedback and no cap coupling etc. And then the tone controls aren't at guitar frequencies. etc. And the freuqency response is so wide as well.

So, I'd sure like to hear it clean & dirty.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

This is an interesting topic. Stephen, can you take the Lightning, for example, and work the power section to use only one EL84?

I took the tone controls out on mine...it didn't need them. It was indeed relatively clean, but like most 50's amps, hifi or otherwise, considerable distortion was present above half way on the volume. A very sweet distortion too, like a top class Vox. Smooth and sweet.
It responded well to a good drive pedal, but would show up the inadequacies of poor ones very clearly, such was its clarity.

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I would be very interested in a tc-15 with one el84. Would it be Class A SE?

thanks

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rick...
rom. 5:8

I would be very interested in a tc-15 with one el84. Would it be Class A SE?

thanks

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rick...
rom. 5:8

That would be cool and worth a try to. All SE amps are Class A. Would you want a full TC-15 or just one channel?

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

The full tc-15!!! I believe there is a horde of church players that would love an amp they could crank and not be overpowering! This would be the jewel in the low watt crown!

thanks

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rick...
rom. 5:8

Laney has a new 5w amp that (on the website, i havn't heard one live) sounds really good. Check it out - http://www.laney.co.uk/show_prod.php?prod=l5t-112

This could be a great practice/recording amp.

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rick...
rom. 5:8

I have to agree with both of you. That would be a jewel. Look at how many people are playing the the church venue in this forum. Big halls too loud. A full TC + a single 84. I can see you getting a great line Coco.

Of course then there's us that are so old we're deaf and going to turn it up, baby Rock and Roll

Hmm, very interesting. ...wheels turning...

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Stephen, it would be seriously incredible. And I completely agree about the church thing. Does anyone remember the pic I posted of my sanctuary?

I'm happy with my Lightning, but the EF86 side might be interesting to try if it doesn't mean replacing much.

I remember, james.
Very big hall. I can see you drowning everyone with no problem. echo city. Of course is loud bad