A mix of high quality resistors is used in this
amplifier, such as:
-Allen Bradley NOS JAN 1Watt resistors
-Caddock TN130 0,025% precission resistors
-Dale RN60D ,and RN75D 1% resistors
-Kiwame 2 and 5 watt carbon resistors
Sometimes may be a over the top solution, but I had them on the shelf, so why not using them...
To reduce plate dissipation on the 300B mesh tubes, I used a
1k5 / 25Watt cathode resistor ,instead of the original 1K /
25Watt type. This resistor is gold colored one on the
picture. Plate power dissipation is reduces to a safe 21
Watts. Maximum is stated as 28 Watts for this EML 300B.
Two metal brackets lead the main input (220V~)
wires safe to the relais, by inserting rubber
tules. The green resistor is the 4K7 / 2 Watt
Kiwame resistor between the B+ and B++
Capacitors.
As can be seen on the picture left,
room is precious, and the
transformer for the 12Vdc
application is placed far from
signal wires. The small blue
resistor on th
e milli ammeter is a 1 Ohm 1% resistor, as the "Weston" meters have a 1mA FSD.
