I'm thinking of building a Spitfire, but...

[pinkphiloyd]

...I like the EF86 channel of my DC-30 better that the paralleled 12ax7 side. So I was thinking of just using the EF86 circuit in place of the 12ax7 V1 in an otherwise stock spitfire circuit. Would there be a problem running the EF86 into the Spitfire tone circuit? I can't see that it would be an issue but it's my understanding that the EF86 has a considerably higher output impedance than a 12ax7, and that kind of stuff is definitely not my strong point, so I thought I'd ask.

[diagrammatiks]

you'd have a nighthawk.

[Gaz]

The EF86 would have a lot more gain, and you'd have to throw it away to get the same amount of gain as the Spitfire. I think you'd be okay with the simple tone control though, the high impedance output being more of a problem with lossy tonestacks. JM2C.

[topbrent]

Did you see this recent thread?

The foxy 18 could probably give you some fun ideas.

http://ampgarage.com/forum/viewtopic.php?t=15778

[M Fowler]

I like what the Foxy 18 has to offer more then the Spitfire.

The Spitfire build stock is a good performing small gig amp.

Mark

[sliberty]

I built a Spitfire some time ago. It is a cool little amp. But after a while, I tired of it, and I rebuilt it as an AC15, EF86 channel only. The differences bertween the circuits, as I remember it, are not that big, but the AC15 was much more fun to play. The cleans had a little more hair on them, and the overdriven sound was more aggressive and rich. I followed this schematic.

[M Fowler]

dartanion has a layout which is basically an 18w lite IIB style with EF86 preamp tube.

I can't post it unless Darren says so though.

Mark

[mick]

Forgive me if I'm wrong but that AC15 schematic is using a EZ81, I don't think it should be wired to the 5v ?

Mick

[sliberty]

I didn't build from scratch, so my power supply was not directly based upon the schem - luckily

[pinkphiloyd]

Thanks guys. Still haven't come to a decision. I was trying to stay away from the 5 or 6 position switch type setup but may end up going that way anyway. Hmmm.

[topbrent]

Dartanion's layout is not exactly secret. It is posted up for general use on the 18watt.com download section and and many other places across the web.

http://www.18watt.com/modules/Downloads ... te_145.pdf

[M Fowler]

Dartanion's layout is not exactly secret. It is posted up for general use on the 18watt.com download section and and many other places across the web.

Yeah I know and in all these years I have never seen it posted here so I figured I better keep it that way. Whole lot of us are 18w and other forums so I figured they could find it by google too.

Mark

[pinkphiloyd]

and you'd have to throw it away to get the same amount of gain as the Spitfire.JM2C.

I'm not sure I follow what you're trying to say here; care to restate in different terms?

[ampmike]

The Foxy 18 is one of my favorite amps I have built.I have to make one for a kid here.My was from Brown Note.Great little amp,Tons of gain.Mikey

[pinkphiloyd]

Finished. Something's not right. It's sparkly clean to the top of the dial. It's loud. It's sounds really, really, good. But there's no break up anywhere. Start poking around tomorrow. I can't do anymore today.