Cast Aluminium Wok with Gas Burner: a 10.5 kW cooking arrangement

With frequent trips to Asia (almost half-time living there at the moment), I don’t really get sick of Asian food. Even more so, if we can all it European style food, cooked in a wok. All fresh vegetables, some meet, some fried rice, cooking limited to a few minutes, and not a lot of dishes to wash up afterwards.

This is the arrangement. The wok, from Thailand, is cast aluminium, and very good for all kinds of wok cooking styles, including stir fry, fried rice, deep fry, steam cooking, and so on.

wok arrangement

The real key to wok cooking is not so much the wok itself, which comes in various types of materials (never take anything that is coated, either black steel, cast iron, or aluminium give the best result). The real key is the burner, and its power. Unless, if you have a really strong custom build induction coil heater… more about his later.

The burner, it is propane fired, and comes in an easy to assemble set of parts, for about EUR 40, delivered. Great value.

wok burner

See the data. The power is pretty good, and can be regulated down a bit if needed. But most times, I use this thing full power, along with a 5 kg propane bottle, which seems to last for a while.

wok burner1

Before you use a new wok, be sure to clean it properly, and then burn-in by using some vegetable oil (heat resistant, don’t use olive oil). With some paper towel, and a wooden stick, wipe the wok inner surface, while it is really hot, and until some brown layer is forming. This should all be done on outside, and only use a small amount of oil, and never hold your head anywhere close to the wok, because the fumes may catch fire any time. At my end, everything worked out nicely and quietly, but not without the smell or burning hot vegetable oil.

wok burn in

After cool down, time for some first dish. This is not a cooking block, sure you will find your own recipes.

work 1st dish

Cleaning is easily accomplished with hot water and a very minor amount of a mild cleaning agent. If at all possible, just wipe out and clean with water, no cleaning agent, and use daily, to preserve the anti-stick properties of the surface.

Dual CV 1600 Stereo Amplifier: a real HiFi classic with some capacitor smoke, and a very large dropout voltage regulator

This one is a real gem, a stereo amplifier, Made in Germany, and nicely constructed in the 1970s, using mostly discrete parts.

cv1600 front

Some issues are common to all old amplifier, like, defective switches, aged contacts, and so on, but these can be fixed with good contact spray, or by (mechanical) repairs. For the CV 1600, most common fault is the X2 mains capacitor, 47 nF, which will eventually turn into smoke and stench. Be sure to replace this part, if you have a CV 1600.

The 47 nF X2 rated cap is located on a fuse board, and to get access, you need to remove all the transistor wires. This is best done with great care, and without damaging the wires, otherwise, it is quite laborious to connect everything back up again.


This CV 1600 also had another issue, no signal from the distribution amplifier board. Some first check showed issues with the +15 V rail being stuck at ~7V. Probably a defective Tantalum or other capacitor? Probably not – not much current flowing either, so it is not related to a short at the output.


Inspecting the regulator – it is a TO-202 LM341p15, pretty rare nowadays.

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No heatsink on the regulator, so I got a bit worried with the dissipation of TO-202 vs. TO-220 devices – all I have in stock are TO-220 regulators, LM78xx series.

cv1600 to202 vs to220

lm341p15 to202

lm7815 to220 heat resistance

After inspection of the datasheets – nothing to worry about. Pretty similar heat resistance, junction to ambient. Voltage drop is about 10 V, current roughly 50 mA, so, 0.5 W – roughly 30 K temperature rise.

A quick test with a 5.6 Ohms, 250 W dummy load showed no further issues (except an incorrectly installed signal cable, probably from an earlier attempt of someone else to fix this unit?).

Finally, some performance data of the CV 1600.

cv1600 data