A couple readers of this blog have contacted me letting me know about the Giulietti amps they own. One, Nathan Neves, has sent numerous pictures of his amp and has given permission for me to share them with you. So attached are some pictures of his Giulietti.

A master volume control located between the phase inverter/splitter and the power amp provides the capability to reduce the input to the power amp as the power amp supply voltages are reduced.

The Echo Mona … is a fairly decent unit that had gotten good reviews when it first came out. I’ve been happy with mine except for one thing: The preamp gain controls are unreliable.

Again, there are many ways to do this passive resistor load. A lot of these techniques, including the ones used by many commercially available load boxes, don’t maintain a constant impedance load to your amp as you change the attenuation. People debate whether this is important. You can search the net for these discussions. I decided I wanted to keep a constant impedance load to my amps.

Eliminate rattle in old EV speaker cabinets with weatherstripping foam.

By Sid of Stone Marmot

Warning: To keep this article a reasonable size, I purposely skipped listing all the safety steps I had taken while troubleshooting this amp. There are some very high and potentially lethal voltages and currents in these tube amps. If you are not intimately familiar with the safety precautions [...]

By Sid of Stone Marmot
I wanted a low power guitar amp I could crank up to get natural tube distortion without being obnoxiously loud. I also wanted something light that I could easily carry to more laid-back jams. I also had a small tube amp lying around that used a pair of 12AB5 [...]

By Sid of Stone Marmot
My Telecaster is a 1990 American Standard that originally had the TBX tone control. A lot of people don’t like this tone control. I myself never really minded it since I rarely use my tone controls on my guitars. But, on examining the way the TBX control itself works, [...]

By Sid of Stone Marmot
Those of us who build or refurbish guitar amps and speaker cabinets often have a hard time finding speaker grill cloth. What we do find is rather expensive and usually has to be mail ordered. For example, the cheapest grill cloth Antique Electronics Supply sells is $19.95 a yard [...]

by Sid of Stone Marmot
The Celestion G12L-35 is a 12 inch guitar speaker Celestion made from the early 1980’s to about 2000. Information on this speaker is hard to find, but from what I have found it was intended and used mostly for the Marshall 8412 guitar speaker cabinet. This closed back cabinet [...]