#22awg solid wire for heaters

[etneccas]

Can #22awg be used for heaters on a deluxe reverb build

[Pedro Vecino]

Two 6V6 = 900mA
Six 12AX/T/7 = 1800mA

22AWG = 920mA

I would not use it.

[Helmholtz]

This table specifies 7A max for chassis wiring: https://www.powerstream.com/Wire_Size.htm

[etneccas]

Two 6V6 = 900mA
Six 12AX/T/7 = 1800mA

22AWG = 920mA

I would not use it.

Where did you get 22AWG =920mA from?
The chart says 22AWG is good for 7amps
But it did not say what type of insulation
The 22AWG I have is 600volt rating

[Jon Snell]

I found this useful size guide.
Mainly for power electrics but shows the expected voltage drop and lengths of cable run.
If I only had 22g wire I would feed the heavier heaters first and then a new run for the other smaller heaters. A single run has too many losses at that core size.

[Pedro Vecino]

Where did you get 22AWG =920mA from?
The chart says 22AWG is good for 7amps
But it did not say what type of insulation
The 22AWG I have is 600volt rating

From here: https://www.solar-electric.com/learn...per-wire.html/

Honestly: I found the associated low intensity (0,92A) strange.
On the one hand I have thought: it would be very difficult to wire a 100-watt Marshall (7A) following that criterion, and on the other: the output wires for heaters in the transformers usually have a larger gauge.

In this other one the maximum current is differentiated: "in air" and "in jacket". I do not know what it means.
http://www.ohmslawcalculator.com/awg-wire-chart

[Jon Snell]

In air means air cooled plain copper or tinned copper exposed to air. Jacketed means in a sleeve, not able to cool like plain copper can, meaning less current for a similar gauge.

[mozz]

22 awg =3 amps

Those other charts are for some special purpose, i would never run 32 amps through 14 awg yet is says 5.9 amps for power transmission?

[mac dillard]

What size wire do I need?
For almost everything inside any AX84 project amp to date, 22 gauge is plenty; this size wire will carry at least 7 amps in chassis wiring. Certainly this is plenty for everything besides heaters. For those, add up the heater current for the tubes you plan to use. Add in 20% to 100% for inrush current (depending on how paranoid you are). If the result is less than 7A, you're fine. Or wire some power tubes in parallel, rather than all tubes in series. See table below for other wire sizes. Larger wire sizes may not fit in your tube socket terminal holes, esp. on 7 pin and 9 pin sockets. So use the smaller of the sizes available that will carry enough current. You also care about insulation breakdown voltage (next question).
American Wire
Gauge (AWG) [1] Current
Capacity [2] Nearest British
Wire Gauge (SWG) [3] Ohms /
Foot [4] Ohms /
Meter [4]
18 16 amps 19 0.00651 0.01953
20 11 amps 21 0.01035 0.03105
22 7 amps 23 0.01646 0.04938
24 3.5 amps 25 0.02617 0.07851
26 2.2 amps 27 0.04162 0.12486
All data from 1978 ARRL Radio Amateur's Handbook or computed from data there.