CreamSound CS-1/6 guitar combo amp

The CreamSound amp has been designed to be used in the small training rooms, where slight
power is desired. One of the most important targets was to achieve a very low hum level,
when the amp is suitable for studio sessions.
The amp is designed to give a lot of harmonic distortion when needed.

Tube amp generates both even and odd harmonic distortion components which differs
significantly from each others. The triode tubes - which are commonly used in preamplification
section - generates both components but mostly second even component.
The pentode tubes - which are commonly used in power amplification section - generates
a small amount of second even component and a lot of third odd component.
The second even is softer and more pleasant to hear than the third odd, which is tighter
and clearer and is a little bit more unpleasant to hear alone.

The output stage of more powerfull amplifiers use commonly even amount of pentode
tubes, which are coupled in push - pull operation.
When using push -pull operation, all the even harmonic components - from output pentode
tubes - are eliminated and only the odd components are present.
Almost all the amplifiers are designed to use the negative feedback coupling. The main
purpose of this negative feedback is to reduce the distortion and get better frequency
response.

The CreamSound amp has one double triode in the preamplification section and one
pentode in power amplification section ( Class A ). The amp has not negative feedback
coupling in order to get more harmonic distortion.

The amp has two volume pots - one for the preamp and second for the power amp.
The preamp section generates second harmonics which can be blended to the third
harmonics generated in the power amp section by power amp pot.

The amp has one tone pot and a bass-cut switch, that cuts a little bit of bass frequencies.

The design of the CreamSound amp is based on different kind of known tube amplifier
solutions, which have been modified because of practical reasons.
There are no details which have not been in practise during the whole history of tube
amplifier constructions.
The preamplification section is based on the old Fender Princeton and Champ Amp
circuits. The power amp section is based on the old Finnish Salora tube radio receiver.

The transformers are designed and manufactured in Finland and are based on commonly
available steels and wires. The quality of the transformers is the most critical detail when
designing the tube amplifier.

The amp is hand wired point to point without any printed circuit board. This ensures that
the loss of high frequencies is minimal and all the rich sound is present.

The loadspeaker is Celestion 10" Vintage, 60 W. The loadspeaker has very good bottom end
and a rich medium and top end. Additionally its efficiency is good.
The measurements of the cabinet are based on the old Fender and Gibson amplifiers and
is open back design. There are some other guitar amplifier manufacturers too, who have used
this cabinet size.

The material of the cabinet is 16 mm particle board and the material of baffleboard is 18 mm
plywood. 500 mm W x 400 mm H x 230 mm D.

The CreamSound CS 1/6 amp is certified in Finland by FIMKO and has the right to be
marked with FI label.

Specifications

Preamp tube. . . . . . . . . . . . ECC 83 ( 12AX7 )
Power amp tube. . . . . . . . . . .EL 84 ( 6BQ5 )

Output power, pure signal. . . . . . . . ~ 4 W
Output power, 10 % distortion. . . . .~ 6 W
Output power, max. distortion. . . . . ~ 9 W