I built Joe Bento's guitar amp for my son a few days ago. It was a
simple project to put together. I did swap out the 35W4 tube with a
50DC4 so I did not have to put a dropping resistor for the filament.

This little amp works great, here it is in the raw. I was going to sand
and spray paint the chassis but I decided leave it as is.

Sal

Sal wrote:
I built Joe Bento's guitar amp for my son a few days ago. It was a
simple project to put together. I did swap out the 35W4 tube with a
50DC4 so I did not have to put a dropping resistor for the filament.

This little amp works great, here it is in the raw. I was going to sand
and spray paint the chassis but I decided leave it as is.

Sal

Nicely done, Sal.

-Bill

On 2009-06-05 06:04:53 -0600, Sal said:


I built Joe Bento's guitar amp for my son a few days ago. It was a
simple project to put together. I did swap out the 35W4 tube with a
50DC4 so I did not have to put a dropping resistor for the filament.

This little amp works great, here it is in the raw. I was going to sand
and spray paint the chassis but I decided leave it as is.

Sal


Very nice, Sal. Isn't it amazing just how loud 3 watts is when feeding
an efficient speaker? I'll have to remember the 50DC4. That resistor
is otherwise just a source of heat under the chassis.

I made another amp with a 12AX7 and 50L6. Did I post a photo? I don't
remember. Inserted again for your viewing pleasure. I havn't
transferred this one to a permanent chassis yet. In this one, the
primary of the transformer is wired for 240, giving 60V at the
secondary - perfect for the series string heaters. Plate voltage is
then derived through a solid state doubler. I alctually like the tone
of the 50L6 better.

I think I'll stick with alumunum for most future projects. The black
powdercoat chassis, while very nice, is much harder to work with than
aluminum.

Thanks Joe,
I wondered how you dropped the filament voltage, smart idea.

Maybe I have to build the 50L6 version... :-)

Sal

Joe Bento wrote:


Very nice, Sal. Isn't it amazing just how loud 3 watts is when feeding
an efficient speaker? I'll have to remember the 50DC4. That resistor
is otherwise just a source of heat under the chassis.

I made another amp with a 12AX7 and 50L6. Did I post a photo? I don't
remember. Inserted again for your viewing pleasure. I havn't
transferred this one to a permanent chassis yet. In this one, the
primary of the transformer is wired for 240, giving 60V at the secondary
- perfect for the series string heaters. Plate voltage is then derived
through a solid state doubler. I alctually like the tone of the 50L6
better.

I think I'll stick with alumunum for most future projects. The black
powdercoat chassis, while very nice, is much harder to work with than
aluminum.

------------------------------------------------------------------------

Bill M wrote:
Sal wrote:
I built Joe Bento's guitar amp for my son a few days ago. It was a
simple project to put together. I did swap out the 35W4 tube with a
50DC4 so I did not have to put a dropping resistor for the filament.

This little amp works great, here it is in the raw. I was going to
sand and spray paint the chassis but I decided leave it as is.

Sal

Nicely done, Sal.

-Bill

Thanks Bill.

Sal