Personal Comments
©2011, Bob Putnak. This post examines the performance (directly related to the input impedance) of low-cost meters; specifically, I explore a common multipurpose Colluck PM-128E DPM (digital panel meter) and a bargain-priced Cen-Tech #98025 multimeter. Limitations in the design of these low-cost meters can severely affect measurement accuracy. First of all, I prove that the […]
Limitations of cheap DPM’s and DMM’s Read More »
Meet the TubeSound TTM-1: Testing of almost all amplifying tubes (triode, tetrode, pentode, beam power) from antique 4-pin (such as a #10, #45, or #50) through 9-pin novar (such as a 7868). Socket configuration — 4-pin, 5-pin, 6-pin, 7-pin medium (aka 1625), 7-pin miniature, octal, loctal, 9-pin-miniature, and 9-pin novar. All tests use exact tube
TubeSound TTM-1 Tube Tester & Matcher Read More »
April 1, 2011. TubeSound, a worldwide vendor of audiophile tubes & test equipment and service center, is pleased to announce the appointment of Snickers T. Dogg to the position of Chief Technical Consultant. “Snickers will be a valuable addition to our team by growing our service center in a valued-added result-driven manner. He is a
PR: new hiring of Chief Technical Consultant Read More »
Copyrighted by Bob Putnak, all rights reserved. “Sometimes output tubes must be selected which will provide a satisfactory balance adjustment. A tube tester usually will indicate whether a pair of tubes have reasonably similar characteristics.” – Robert Middleton, 101 Ways to Use Your Audio Test Equipment, Howard Sams Inc.[1] “Tube matching” is a controversial and
Tube Matching with a Tube Tester Read More »
This is one of many examples where tube testing requires experience to properly evaluate any tube. In this situation, using a tube tester would yield a completely wrong answer. These tubes were factory marked as E283CC, but are actually 12AX7A tubes. Hence, if you tested them in your tube tester using E283CC settings, you would
when E283CC tubes are actually a 12AX7 Read More »
