JTM 18.wmv

New amp build with JTM style preamp into a cathode biased pair of EL84 power tubes for about 18 watts clean output. Running this amp thru my Heatsink attenuator (my own design) and then into a 1 x 12 cabinet fitted with an Eminence Tonker speaker. The guitar used is an Ibanez Artist AR250, upgraded with a couple of Gibson ceramic pickups.

The video starts off with the attenuator in bypass mode, but once I get the volume cranked up and the amp starts breaking up the Attenuator is On, bringing the overall volume down. You can't detect the difference on camera because the onboard compression limits the overall volume the camera picks up. There is very little to no tonal changes with the attenuator On, just a reduction in volume.

Category:

Music

Tags:

• Marshall
• 18
• watt
• amp
• demo
• JTM

[jacusienieczek]

Sounds really good. Did you use NFB with presence or is it master volume pot first from the left?

[hasserl]

@jacusienieczek

No, I didn't use nfb. I voiced the amp on the bright side and the Presence is actually a "Cut" control, as used on Vox amps. No master volume.

[jerrydyer]

you gonna do a vid with the attenuator? hey Richard

[hasserl]

Yep, gonna upload one soon. I took the opportunity while I had it connected to this amp and the camera out to shoot one. Hope it comes out OK.

[neverwasnorwillbe]

So how does this sound compared to the sibly

[jp6l6]

Interesting demo and that sounds very good ! Super !