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April 9, 2021: You might have seen the note about the wood troubles at our cabinet shop, but we have found an alternate source and everything is good to go now! Cab turnaround is back to normal. 2-3 weeks!
www.tedweber.com

www.tedweber.com

RSUB_PWR-LO Resistor Substitution Box

Use: B+ power supply resistor string filter node adjustment.

$25.00

Low Power Resistor Substitution Box, 0-5K, 2 watts.

OK, I admit it. You can calculate circuit values until the cows come home but sometimes it’s so much easier and faster to just dial it in. I’ve been a ham and involved in engineering for over 35 years, and I gotta tell ya, these are undoubtedly some of the most indispensable tools I have ever had.

The Low Power Resistor Sub Box is a 5K, 2 watt wirewound pot you use for final tweaking in the power supply chain feeding the preamp stages. Believe me, tweaking this way and dialing in a sweet spot will just make your jaw drop, it is so easy and fast. I realize these are unregulated power supplies, but getting it close and ‘nominal’ by this method saves a ton of time.

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