Advice on wiring to tube pins in a combo build

[steve-o]

I wanted to get some people's take on how to do a layout for an amp I'm building in the chassis of my old blues Jr. The issue I'm having is that I'm a little cramped for space. So, I was going to solder some of my components directly to the pins on the tubes (see schematic. For example, the 1k5 resistors going between pins 2 and 6 on the EL84s, or the slope resistors coming off of the 3 and 8 pins in the preamp stages).
The thing I'm concerned about is the heat these compenents will be exposed to. 1/2w of current isn't that much for the resistors heat-wise, but since the tubes hang directly below these components, I'm worried about the heat venting up from the tubes.
Is this something I should even worry about? I could just wire stuff up to the pins a remeber to check the values whenever I replace my tubes. Or is there some sort of thermal insulation/protection I could use on my components? What do y'all think?
steve

[keithrick]

I do not think you will have a problem. Resistors are commonly soldered directly to tubes as grid stoppers.

[dehughes]

Just think of Matchless when you do it....

[steve-o]

Hey, thanks guys! I will gonna' start soldering stuff up as soon as I get a new pencil for my soldering iron!
steve

[mhuss]

Another thing you can do if you're worried about heat around the 6BQ5s is to use the inexpensive BC 1 or 2w metal films available from Mouser and DigiKey. The 1 watts are sized like 1/4w CF/CCs and the 2 watts are a little larger than the 1/2w CF/CC.

Neither of the resistor positions you cited have any self-heating at all. The screen resistor(s) are the only resistors (outside of the ones in the power supply) that I'd worry about heat problems.

--mark