Jim, A familiar problem. Had an old Westinghouse RBM rcvr that was loosing tubes till I found the fil was at 7v..... WOW! Looked at the P.S. tag and ac input was spec'd at 115 v while my line was about >125. Found an old TV compensation transformer with a +/- 10 v switch . Took care of that. There can be found 5-10 amp isolation trans primarily for using with overseas 100v ac appliances as well as tapped autotrans with a range of compensation. Look for them in the surplus houses and travel suppliers. I have played with some large resonant 20a stabilizer units but they were objectionally noisy as well as heat producing and reflected the adjustmnt as a higher current draw that on a soft wall circuit just compounded the problem. My personal preference is the good old 20a autotran which does need to be fiddled with but can get whatever you need. The small 10v step downs are fine for receivers etc but get expensive in high current sizes. Have never tried the buck/ boost hookup but my line voltage can vary more than 15v throughout the day to say nothing abt the summer brownout season so a variable works best for me. Stable line voltage is a major problem with most tube testers as well since the line adjust is just a reostat on the trans pri. I run the adjust all the way up and use the bench autotran to adjust to set line.
Good luck! Bill KB3DKS --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html The reason this message is shown is because the post was in HTML or had an attachment. Attachments are not allowed. To learn how to post in Plain-Text go to: http://www.expita.com/nomime.html ---
