Quick Tip #1 - How To Identify Unmarked Tubes

[@terryblackman6217]

Great tips Mike. I remember my father doing this, taking it out of the fridge and breathing on it.

[@lawrencehalpin6611]

Thank you. I appreciate all that you are teaching me. Kind regards

[@KS0JD]

Great tip!

[@TheJunkman1961]

Great tip. Thanks!!!

[@Dennis-uc2gm]

👍 nice tip, will have to remember to try that.

[@jimgiordano8218]

COOL trick.

[@jimnewman5596]

Great tip Mike, I have used a black light and sometimes it works, or on an washed out label on the back of the radio to see the model number.

[@MikesRadioRepairRestoration]

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[@jonbutzfiscina1307]

Rub the tube in your hair (or someone with hair). The oil will show up the numbers. Ludwel Sibley taught me that 30 years ago.

[@luminousfractal420]

not even gonna ask. n1