2011年12月3日 · Just had to test up a pile of AA5 tubes here for some orders. I probably tested a dozen each of 12SA7, 12SK7, 12SQ7 , 35Z5 and 50L6. Guess what? I kept coming up with …

2025年3月1日 · Last visit was: Mar Sat 08, 2025 6:47 am It is currently Mar Sat 08, 2025 6:47 am

2014年9月1日 · The two 12sk7 tubes were fine, I just didn't see that they were lit-----it was suggested that they can be hard to see-----From there I noticed that the speaker field coil had …

2025年1月10日 · It looks like the 152T, but this one is a 6-tube layout, using a 35W4 rectifier instead of 35Z5. The rest of the tubes are the normal lineup 12SK7, 12SA7, 12SK7, 12SQ7, …

2025年1月28日 · Here is my S-38B. I made a one transistor oscillator so the BFO would be more stable. But the gimmick capacitor is the same. The blue wire has a few twists around the wire …

2014年8月25日 · so i did some tube swapping and low and behold, one 12SK7 tubes was causing the problem. the problem followed this tube in my two 'bench' test chassis. it is not a mis …

2005年9月26日 · Sometimes it works, but the 3-5 connection for G3 and cathode can present a problem in a few radios where connection is made to only one of those pins on the …

2015年10月4日 · Funny thing, I first attached a lead to the 12SK7 heater socket lug, and tied it to ground, and the set wouldn't work. I then removed it and tied directly across the two switch …

2007年2月17日 · When I was growing up during and just after WW2, My Dad serviced radios and I remember that the 35Z5, 50L6, 12SQ7, 12SK7 and 12SA7 series of tubes as the Victory …

2016年1月23日 · 12SK7 is the octal version of the 12BD6. AFAIK, there is no miniature version of the 12SJ7. Perhaps ...