Dennis I should have been more precise, I didn't mean to imply that the 7A26 had differential inputs but that the internal signal path was differential. If you look at the block diagram in section 7

Wow good news!  I hope one of those will end up here.  Keep me informed. Bob818 894-2887

Hi Ron, This is not what is causing the 1/2 gain in one of the two channels but not the other. The 7A26 is not differential. It has two separate input channels. In certain cases the 2nd channel can

EVERY Tek curve tracer, except for the limited plugin versions (7CT1N and 5CT1N) have two "sockets" to do A/B comparisons. This includes the 570 (vacuum tube curve tracer), 575, 576, 577, and 370. The

Look at the Oilite web site. They state that the oil is infused via vacuum. This is what I always understood about how Oilite bearings were made. There are sintered bearings that are meant for an

You're right it was, I saw this on a Science channel show. S

Sorry Chuck, My only experience with these type of bearings is with ones that were already oiled, sorry about that. One thing I like about this list is the plethora of new information. Steve

although I have no specific knowledge of the 7A26, in differential amplifiers if one side is dead then the gain is exactly 1/2 what it should be.

The WD stands for Water Displacing, by the way.  40 is presumably because it was the 40th substance the manufacturer tried.Jim FordSent from my Verizon, Samsung Galaxy smartphone

Hi Stephen, I don't recall saying anything about the original infusion with oil. I generally receive sintered bronze bearings that are bone dry from a distributor, such as MSC. I don't recall ever

WD-40 Spent a couple of years working in the tropics with extremely high humidity. I used to protect tools from rusting by wiping them with WD-40 then storing unused tools in plastic bags. What I

I have a 535A that I just finished mostly refurbishing I would part with. It's got all new tubes, almost all the capacitors replaced, one broken resistor replaced in the vertical amp, and calibrated

Snagged two, one already gone. Got a reply from seller and my daughter was able to pick up two. I will get to see them next time she comes up (from SF South bay area). Was excess inventory from the

Thank you. Merchison

I don't think Chuck contradicted that point. Dick described it very well. Oilite bushings are sintered, so they are porous - the number I've seen was about 40% free space - then impregnated with oil.

Chuck, You’re right on all your points, except the original oiling was when the bearing structure was made and the oil was “infused”(??) into the material (oil-lite bearing)where our added oil

Hi and thanks, I don’t need to replace any at present, butTHANK YOU anyway. larry

Parts numbers change, but the theme remains the same: long lived (10K hours), low impedance, 105C, and from United Chemicon, Panasonic, or Nichicon. The only electrolytic that I see leaking on a

I would have to beg to differ, the 577 has the same left/right sockets, left/right lever switch, and as such, comparison capability as the 576. It even uses the same dual transistor plugin

Bonjour, I have acquired a 2465B . SN B062xxx. exc cond but bad power supply, last rev made. Need to recap and replace unreliable rectifiers and power resistors, then debug. Forum has 2011 notes