Komet, Trainwreck "Songwriter"

[dark]

Komet, Trainwreck "Songwriter"!

http://www.kometamps.com/songwriter.html

[IMG:200:107]http://dc305.4shared.com/img/F6g7ciV5/0.7617540081977983/sw_front_full.jpg[/img]

Dark

Rock on!

[Roe]

If it wasn't for the eq, I'd just take this to an ac30 with a normal channel only. or a the brilliant ecc83 channel without top boost.

[selloutrr]

Bass - Volume - Treble

mutant Ch2 from a black face Fender with Vox/ Liverpool power section?

[paulster]

Hogy gave a broad description of how the tone stack works on TGP when this amp was first discussed without giving too much away.

If I remember it wasn't a traditional tone stack at all, but two independent filters.

[tweedeluxe]

I'm guessing the treble is a Vox cut control, due to its position on the panel. Didn't the original use a 6SL7GT for the PI?

If it doesn't have a low impedance FMV style tone stack, two 12AX7 triode stages before an LTP is more than enough to push EL84s into pretty heavy crunch territory.

Since it's known as a clean amp, wonder if the 12AX7 is cascoded or paralleled or something like that.

[Colossal]

My bet on the Bass - Volume - Treble is that the Bass control is varying the degree of cathode bypass to ground, the Volume is between the cascaded (or cascoded) first and second stages, and the Treble is a treble bleed to ground before the PI. Just speculation though.

[M Fowler]

Hogy wrote:

There were two Songwriters made. Both were built onto Komet Constellation chassis I gave to Ken. The first one was an early Constellation prototype that I had put an octal tube in the PI position. Ken made use of that layout by employing a 6SU7 tube (similar to a 6SL7) for the phase inverter. This is "Inger", the amp pictured on the Trainwreck web site.

Then Ken requested and received a standard production Constellation he reworked into the second version of the Songwriter, named "Bree". This amp uses a standard 12AX7 phase inverter. It uses all current production parts used in other Komet amps, Komet transformers, etc.

This is the amp the production Songwriter is an exact copy of, and I mean just that. It's identical to the one Ken built. We've had "Bree" here at the shop for well over a year now, played and listened to it, and compared our production version to the real thing. It's dead on.

This amp is Ken's idea of ultimate EL84 cleans. Very beautiful, complex, 3-D. It has a harmonic coherence that Ken felt leads a player along in a very musical way, hence the name "Songwriter".

The amp is capable of distorting with a medium gain level when pushed, and it does this in a typical Trainwreck fashion. Seamless and dynamic, easily controlled by a player's touch. The amp is also unusually pedal friendly and turns into a real chameleon when used that way.

The amp uses two 12AX7s in the preamp, and four cathode biased EL84s in the output stage. Controls are a unique "Bass Volume" that governs the low end, "Volume" and "Treble". The amp does not use a traditional tone stack.

I hope this clears things up a bit. We're working on sound samples, they'll go up onto the Komet web site as soon as they're done.


Hogy, Komet Amplification

Compared to the Rocket, the Songwriter is fuller and more "honest" sounding (I really can't think of a better term). The Rocket is capable of more gain.

Both are equally harmonically active, with clean notes/chords swelling into harmonic feedback at will.

The Rocket is more dependent on certain tubes to sound as it should, the Songwriter sounds stunning with current production stuff. Although it, like most great amps, can attain another level of complexity with NOS tubes.

[Roe]

vox used different caps for the normal channel, everything from 47nf to 500pf (actually this was on the treble channel on non treble boost amps but this channel is identical to the normal channel with the exception of it having less bass).

the bass controll appears to be a pot connected to a coupling cap to control the bass. probably some kind of high pass filter or something

[andrew]

Here is a bass control circuit at the preamp cathode and a treble cut like a Vox.
http://vtg-amps.com/Melissa/Melissa-2-1a.pdf

[JamesHealey]

I like the fact 'Songwriter' is written in Ken's handwriting

[dark]

+1

Dark

Rock on!

[dr. who]

I contacted JM at Trainwreck a while back about making a copy of Inger for me. He told me no. I guess I know why now.
[img:580:332]http://trainwreck.com/wp-content/themes ... Inger2.jpg[/img]
What are the 2 extra switches, in between volume and treble, that Inger has that the other SW30 doesn't have?

[M Fowler]

Also, Mona Ken's sister had wrote a post to me about this amp and now if you go back to that post her replies are gone. (edited)

Mark

[FUCHSAUDIO]

Hogy gave a broad description of how the tone stack works on TGP when this amp was first discussed without giving too much away.

If I remember it wasn't a traditional tone stack at all, but two independent filters.

Thats an old Standell thing...

[KT66]

Kinda like this ? :