!!CAUTION!!
HIGH VOLTAGES EVEN IF UNPLUGGED!
TUBE / VALVE AMPS CAN STORE VERY LARGE
VOLTAGES! THESE VOLTAGES CAN KILL YOU!
You have to understand how to safely work inside the chassis
of a tube amp. Just reading this is not enough, but here are
a few tips: Never work on a amplifier that is plugged into the
wall socket, always unplug it first! Stand on a rubber mat of
some sort and don't work bare foot, under the influence of alcohol
or any other drug, legal or not for that matter. Here is another
good tip: Only probe an amp with you're right hand and with you're
left hand by you're side. So if you do happen to take a high
voltage shock, the the voltage will not go across you're chest!
High Voltage is stored in the electrolitic capacitors and they
need to be discharged!
That's what I'm doing in this pic.
These are those large round can's and there usually blue or black.
The discharge tool is made of 600 Volt wire with a 3-5 watt resistor
of 500 to 1000 ohms. Basically you clip one side to ground then clip
the other end to the Pos + side of the capacitor. Check with you're
multimeter set to 600 DC volt setting and make sure the voltage has
been discharged.
Just a basic pine box assembled with deck screws, clamps and wood glue. The tweed was a real
pain but I took my time and thats really helps.
Yes its a G12H30, you can see the original lable behind the Hellatone lable.
Sounds real nice with good break up and nice tone. I got alot lucy because
The chassis just barly cleared the speaker magnet!
Do you notice anything different in this pic?? I took out the 6V6's they just could not handle this circuit and I put in a nice matched pair of Wing C's 6L6's and of course I had to pull out the bias range resistor because it was way out and then adjusted it to run just a tad hot. Sounds WAY better now!
Hand made chassis from .090" aluminum with .125" end caps, it helps when you own a tig welder. If you need an aluminum chassis let me know.
But there is still the problem of not having a face plate so I just hand lettered it
with a paint pen and put a clear coat over it.
Layouts done with AutoCAD2000.
I used the biasing layout seen at Hoffmanamps.com
Wanted tubes that break up quicker so I went with 6V6's instead of the 6L6's.
The box is the size of a blues jr. and it has an inpeadence selector and extention jack.
This amp sounds much better compared to my 18watt amp. Though I put more thought into
this build with a better speaker and O.T. so maybe thats why. Update, I desided to put in
as set of 6L6 (wing C brand) power tubes and I have to say I like it even more now!
This amp is true blues player delight, my Les Paul is usible with this amp in every configuration sound-wise staying tonefull, and dynamic!
Here is my first sound bite please don't be to critical of my playing! I used my 5E7 amp with a strat, miked it with an SM57 into a ub808 mixer then direct into a stock sound card of a 5 year old computer. Doesnt get amy simpler than this, one rythem track then one lead played over that. For the software I used was Kristal Audio Mixer, then converted that to MP3 with Cheetha Audio Converter all free software!!
