I am wondering if anyone can recommend a good assortment of resistor values to start stocking a workbench for tube experiments. Looking for info such as 1R to 10M 1/2W or will I need an assortment of 1W also? I already have pretty much every value 1/4 W both 5% and 1% . I also have an assortment of Caps, but most are low voltage as I am mostly a Micro-controller designer. I do own a Dynaco ST70 and a Supper PAS3 for a long time , so am a tube lover.
Alan
Alan
Best to study some classical circuit diagrams (Dynaco as you mentioned, Williamson, Mullard). In general, resistors are between 10k and 1M range. I would not go below 1W, for anode load resistors calculate power and multiply by 3 or 5.
Most coupling capacitors are 0.1uF to 1uF, 630V. Power supply filter capacitors are a different story. If in doubt, use higher wattage resistors and higher voltage capacitors.
Most coupling capacitors are 0.1uF to 1uF, 630V. Power supply filter capacitors are a different story. If in doubt, use higher wattage resistors and higher voltage capacitors.
I find I never use 1/4W except for setting a current regulator using something like TL783.
I have 1R to 2M2, 1/2W but there are many values I never use. Most common being from 22R to 1k, and 1M. I buy 1W parts when the 1/2W runs out. Resistors are cheap. I paid 5$ for 1000 1M 1/2W metal oxide resistors 🙂
I also have 33k/3W, 47k/5W, 100k/5W
and of course I have a box of 100R/5W and some 10W resistors from 1k5 to 4k7.
For caps, I have values from 33nF to 10µF in film, and 22µF to 470µF in electros. Get the highest voltage for the footprint. I have mostly 630V or 1kV film caps.
I have 1R to 2M2, 1/2W but there are many values I never use. Most common being from 22R to 1k, and 1M. I buy 1W parts when the 1/2W runs out. Resistors are cheap. I paid 5$ for 1000 1M 1/2W metal oxide resistors 🙂
I also have 33k/3W, 47k/5W, 100k/5W
and of course I have a box of 100R/5W and some 10W resistors from 1k5 to 4k7.
For caps, I have values from 33nF to 10µF in film, and 22µF to 470µF in electros. Get the highest voltage for the footprint. I have mostly 630V or 1kV film caps.
1/4 W metal film (grid bias) - 1M, 470k, 220k
1/4 W metal film (cathode resistors, small signal) - 1.5k, 1k, 820R, 220R - could go to 1/2 or 1 W
3 W MOX (most other uses) 270k, 100k, 68k, 47K, 33k, 18k, 10k, 6.8k, 620R, 100R, 1R (for monitoring Ik)
10W sand cast (power supplies) - 4.7k, 2.2K, 270R
22W sand cast 4.3 or 4.7k. I bought 24 of them surplus to make dummy load arrays - to measure DC voltage under load. Solder two in series and put as many groups in parallel as needed for the desired load current.
20k and 100k multi turn pots (if you do fixed bias)
630V film caps - 0.1 and 1 uF, 1000 pF
500V mica caps - 27, 47, 91 pF - those and the 1000 pF are the most common caps needed for compensation - if you avoid global NFB you may eliminate
400 or 450V electrolytic - 22, 100, 330 uF
100V electrolytic - 100, 220 uF (cathode bypass, -Vg1 supplies)
68, 47, and 15V 1W zeners
Those are all in my “tube specific” parts cabinet. I will sometimes raid my solid state parts cabinets which have a lot more values, but it is rare and then you only need onsey twoseys.
The Antek 230V and 300V 200 VA trafos are really nice to have on hand.
1/4 W metal film (cathode resistors, small signal) - 1.5k, 1k, 820R, 220R - could go to 1/2 or 1 W
3 W MOX (most other uses) 270k, 100k, 68k, 47K, 33k, 18k, 10k, 6.8k, 620R, 100R, 1R (for monitoring Ik)
10W sand cast (power supplies) - 4.7k, 2.2K, 270R
22W sand cast 4.3 or 4.7k. I bought 24 of them surplus to make dummy load arrays - to measure DC voltage under load. Solder two in series and put as many groups in parallel as needed for the desired load current.
20k and 100k multi turn pots (if you do fixed bias)
630V film caps - 0.1 and 1 uF, 1000 pF
500V mica caps - 27, 47, 91 pF - those and the 1000 pF are the most common caps needed for compensation - if you avoid global NFB you may eliminate
400 or 450V electrolytic - 22, 100, 330 uF
100V electrolytic - 100, 220 uF (cathode bypass, -Vg1 supplies)
68, 47, and 15V 1W zeners
Those are all in my “tube specific” parts cabinet. I will sometimes raid my solid state parts cabinets which have a lot more values, but it is rare and then you only need onsey twoseys.
The Antek 230V and 300V 200 VA trafos are really nice to have on hand.