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Just wanted to say thank you for continuous support. I haven't abandoned the ship just yet but I realised I spent way too much time on a scope project and haven't done enough paid repairs to bring the

Yes, I understand how these work. My question was more about why the explanation where noise from the first stage of an amplifier is fed back (negated, inverted, or, ?) to the input which seems much

Hi Barry, No sighs from my desk, your question is a good one. I think these modern headphones work in the following manner, a small amount of noise comes through the leather in your headphones. At the

There certainly is, in a way, between the title of this thread and noise-canceling headphones: In noise-canceling headphones, a fraction of the outside environmental noise is in anti-phase added to

The solution with reduced value of R693 seems to have disadvantages also, otherwise Tek would have done so I think. That might be the reason that P600 has been introduced to enable/disable interdot

Is there an analogy between this subject and the way noise-canceling headphones work? I'm sorry if that's a silly thing to introduce into this conversation but it might help me understand this a bit

I never knew sighing in chorus existed, defies relativity's simultaneity concept. Raymond

Those TD's should work. Just go through the applicable adjustment procedure in the SM, no special equipment needed. Results will be better than by matching. Raymond

I really don't see a manufacturing defect. Your image shows the underside (base) of the package, with its glass(-like) lead feed-throughs. Packages are purchased by the transistor manufacturer

He does, according to the legend with the image showing the glass seal with the leads protruding. Of course, that's got nothing to do with passivation of the chip inside, apart from providing a

Sigh. Tom Sent from an iThing; please excuse the terseness and typos

My guess would be to save the calibrator from a backed signal (feeding an external signal into the calibrator, AC or DC). Don Bitters

?Exactly. High-gain plugins (Type B, D, etc) were seeing hum on the calibrator. The resistor made the bottom ranges usable. In the 535 Mod Summary, it's Mod #1412, effective S/N 5001. Dave Wise My

I found a set of 4 on eBay that are supposed to be NOS and tested good: https://www.ebay.com/itm/313344479069 These match what's called out in the SN<250K service manual: 152-0125-00, 4.7mA, 15pF. Not

?Dave P, that bottom view of a TO-72 is only epoxy sealing the annular joint between header and can. If that's a Silicon transistor, most likely the can is full of inert gas and the die is passivated

ADDENDUM Grid/Feedback/Cathode caps that are short enough to lie on their backs can be installed that way. The baseplate is 70mm wide. T1 is 26mm + 3mm for wire bends. The feedback resistor string is

Dave, I've had a search through the CDPC (Common Design Parts Catalog) for the tunnel diodes (Tek PN 151-0386-00) in the 465. The service manual says that they are selected from 1N3718, but the Tek

Yes, the intensity modulation of the 7A26 trace by the dot-blanking leakage is only noticeable when looking at a signal which is related in frequency to the 7S12 sweep. In my example, I'm looking at

Dave, A picture is worth a thousand words. Thanks for clearing up the questions. -- Michael Lynch Dardanelle, AR

I was going to offer to send you the "same device" from a 453, only to discover that it's a 2n3441, i.e. smaller TO 66 case! (The 453 has a shunt resistor across the transistor which is either to