Recent content by sdhnc123

Can the Herbert safely run with KT88 or 6550 without overheating? My Herbert is "Mk2". I have a few medium sized fans that I could use to keep it cool. The Herbert gets very hot now and it is running 4xEL34 and 2x6L6. :rock:

I purchased a matched quad of Winged C SED EL34s for the VH4S. The switch was set to "EL34". I put the Winged C EL34s in the amp and used the Weber Bias Rite to check the bias with the new tubes. I noticed that one of the tubes had really low current (4-7) while the other tubes were much higher...

Pros: Excellent sound quality!! Delay algorithms are all very good Does not require Ebtech HumEliminator to eliminate ground loops Sucks less tone than ANY other digital processor I've owned (Axe Fx, G System, G Major 2) Save presets Can be controlled with MIDI Tap Tempo Dual Delay Setting the...

On my VH4S, I burned up the Hum Potentiometer way back in September by not selecting "6L6" on the EL34/6L6 switch when changing tubes from EL34 to 6L6. I replaced the Hum Potentiometer with the part recommended by Peter. The VH4S has been working perfectly and sounding great since that time...

This is a 2011 Diezel Herbert. I am changing the stock EL34s to SED 6L6s & Tung Sol 6L6s. The Herbert is out of the shell and I'm looking for the EL34/6L6 switch. Does the Herbert not have this switch?

When I'm playing riffs at LOUD VOLUMES, I get a great tone from the Herbert. However, when I play leads at LOUD volumes, the EL34s are breaking up in a way which is harsh on the ears (ice pick!!). I'm using Seymour Duncan Blackouts (AHB1) and Vintage30s (closed-back cabinet) . I've tried...

So my new Diezel Herbert arrived. :) This is the best metal amp I've ever heard. This thing is like a bull. Cleans are very much like running the guitar through a bass amp but with more of a tube driven sound. Cleans are VERY good. Channel 2 works for metal that is more like hard rock and...

What is the value of the bias trim pot that is used in the VH4S? Thanks.

While changing power tubes to 6L6 in my VH4S earlier this month, I burned (smoked!!) the hum trimmer because I forgot to set the switch to 6L6 instead of EL34. I followed the suggestion to use resistors as a temporary fix. This works, but there is a lot of hum. Would one of these parts be...

My new VH4S arrived last week. I am concerned that something is not working correctly. My VH4S sounds like the "vintage" mode of one of Mesa's Rectifier amps except that the VH4S still has the bass frequencies. My friend commented that the amp sounds like there is a pillow over the speakers...

I want to try some KT77s in my VH4S instead of the stock EL34s. In the VH4S, how are the output tubes arranged? Are the inner tubes for the left channel and the outer tubes for the right channel? Or are the two tubes on the left for the left channel and the other two tubes on the right for the...

What year(s) were KT77s shipped with the Herbert?