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My question concerns the 2N4101 PRX TO-66 transistors in which 3 have been blown open. I found possible replacement parts here (

I'm looking for a lab in southwest Ohio that can provide a trustworthy with-data cal of an HP-3456A.? I'd rather drop off and pick up than ship the unit. Any recommendations? Thanks, John

Sounds like a winner, thanks

I've had a Transistor Devices 1 kW e-load that I bought used around 20 years ago. It gets quite a bit of use, often at or near its rated limit. I have only ever had one failure, and it was an easy fix

I have a pair of the RBL488 800 watt version of these. They Just Work.

Thanks, here is the listing on eBay ( https://www.ebay.com/itm/Transistor-Devices-Dynaload-DLF50-85-500-2/173599434187?hash=item286b5525cb:g:L90AAOSwiFtbez~E:rk:2:pf:0 ) of what I am looking at. The

I have used several of the Transistor Devices DLA, DLF series loads, and I have a small one I acquired. Documents should be available from them or from whomever has purchased them. Most of the ones I

I'm not familiar with this model, but I used to use Transistor Devices loads and power supplies while I worked in a cal lab at a Navy base years ago. ?Transistor Devices loads were always pretty

Well played. I repaired a 8644B that was dead above 1030 MHz. It was a bad SPDT microwave Gas switch chip on the doubler module. HP used a lot of these chips (AS002M2-12) that are still available. I

It’s basically a 64-bit clocked input shift register with a latching output register connected to the display. The “clocked” aspect is important: the analyzer is useless without a data clock.

see https://www.radiomuseum.org/r/tdi_dynaload_dlfd_50_40_200.html I believe this is a dual channel 85 volt 500 watt unit. hese were overbuilt almost to mil spec.

TDI Dynaloads are great products. Manuals are available. I have a couple of them a 150W and a 1KW units and they are pretty bullet proof. -- Sam Reaves ARS W3OHM Owner and Moderator of:

It was C29, a .22uF 35V SMD tantalum capacitor. All better now, though I need to order a suitable replacement. So I guess nothing too unusual here. The original fault was a shorted tantalum in one of

In digging in my storage building, I ran across this little HP box, 5000A logic analyzer. I have read the description in the 1975 catalog, so have an idea of what it does/can do. The X-OR function

I am looking at a DC electronic load and have come upon a Transistor Devices Dynaload DLF50-85-500, does anyone have experience or thoughts on this?

Maybe not - I don't find anything getting hot. However, the -15V rail is MIA from the near end of R41, which has gone open. Dead short to ground on the -15V rail, I guess that's my problem :). It's

Ok, that is good. I find them to be very useful for these kinds of problems. Also, you might try unplugging modules as you monitor the current. Something is dragging it down. I live in Forest Hill,

I forgot to mention that I have two LED error indicators lit on the IO board, looks like they're designated LED_BUS(5) and LED_BUS(6). I haven't seen any mention of those in the service manual, so I

Hey Tom, thanks for your kind offer, but I think I can snarf one from work. To answer your question, though, I'm in the frozen tundra of Montreal, Quebec. Are you nearby? Siggi

I have an 8657B and it's great so I would say go for it, at that price you can't go far wrong. Let me know if you don't want it and I'll be down to collect it like a shot - mother-in-law lives in