Ask Amp Tech Expert Skip Simmons

Hey Skip!

I recently purchased a Bogen E-10. I was really pulled in by the light switch style On\Off toggle. 

The previous owner installed 1/4 jacks for the Speaker and Mic but I'm not sure how to go about switching the impedance or checking what it is. I do see the impedance selector on the back of the amp and the ground tie down but am unsure of what cable to use.

Here are some photos of the amp, the guts and the schematics.

Thanks for any help you can provide!

Many years ago in the quest for a decent amp I finally shelled out some clams and bought a brand new Sonny Jr. Cruncher, with one Weber 10" and two Weber 8" speakers.

What's the consensus opinion of this amp?

I like it but it's kinda big and kinda heavy. Not Bassman big and heavy but still... ooff!

Anything that needs upgrading on these amps?

Hello,

I have just ordered a second hand CUB 10 amp.I

If I were to replace the tubes what would you recommend?

Let me say I am not at all a gear-head, but I like experimenting :)

Another thing I wanted to ask you is if you could recommend (to your best knowledge) another 10" speaker I could find in Europe (particularly in Spain) with a comparable quality to the Weber 10A125 that Dave recommends in the amp review ? continue reading...

Hello Skip,

As a novice about to try and make an amp I would have thought it best not to mess about with a design classic. That said I just wanted to ask if there are any simple/minor tweaks to a Fender 5F2-A circuit that would be appropriate for harmonica amplification.

Thanks

Joel

I have the Windy City 8" 5 watt amp and have recently noticed a low volume 60Hz hum.  I have checked with clean power, ground with nothing conected and hum stays consistant.  Not effected by swithches, volume or tone.  Should I replace the Tubes? or is there a test I can perform to issolate the issue?

Thanks Brian 

Hi Skip

I have got the idea in my head that it might be an enjoyable project to build my own amplifier. How realistic is it to think that I might learn what I need to know from a book and successfully make something from a kit? I am a cabinet maker by trade but I suspect the cabinet is the easy (and less dangerous) bit. If it is feasible is there a book you could recommend? Thank you.

Hello skip .

I have been given a blackstar amp .

https://reverb.com/uk/p/blackstar-ht-5r?hfid=36513576&utm_source=google&...

  continue reading...

Evening,

Having a respected Tech work over a Masco MA 25 I picked up for a good price. It's not pretty (and will need some work) but I'm crossing my fingers. Just looking for some recommendations on any harp friendly adjustments. Or maybe it kicks ass as is after a nice tune up?  Any and all thoughts, stories, or warnings welcome. 

Thanks in advance.

SJ

P.S.  The amp appears like it's not modified in any way. 

Your thoughts on the Stage 5 Delta V6?

Hi Skip I have a Hotrod Deville Im gona convert to a PTP 5F6-A bassman. Got few of questions, 1. Im gona use the devilles FWB rectifier set up, I was gona put a 20w 200ohm "sag" resistor between the rectifier and first filter cap also this should help drop the voltage alittle too right?  2. continue reading...