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Yeah, the fans in my HP 8566A spectrum analyzer and 8350B sweeper are pretty darn loud, too.? Don't have a 7904A to compare, just a 7904.? FWIW.?Jim Ford?Sent from my Verizon, Samsung Galaxy

Hi Raymond, Old fashioned electrolytic capacitors have a fairly reactive, (to aluminum) highly conductive, water based electrolyte. The capacitor's leakage current creates an electrolytic cell with

Michael, Yes, used on all, my B36xxxx instruments have them as well.

Bob, Excellent! Thank you. Were these used on the much later model 576? I also have a 576 that dates from the mid 1980’s and I do not recall seeing these in that unit. -- Michael

Hi Eric, I think in the case of the +150% - 100% rated capacitor, they were using the "-" as a hyphen, not a minus sign. I think they meant to convey that the capacitor could range in value from

Hi Reg- What y'all need to solve the fan noise problem on the 7904 is a Type 555 mainframe! Just turn it on for a little while and when you turn it back off you won't even realize the 7904 is on!

No need to apologize, Dennis. On the contrary, it all stems from the work you do for us. Raymond

Last night I noticed it had been over a week since I got the last daily list of possible SPAM emails my ISP was holding up. I go through every one of these daily SPAM reports I get and unblock the

For the life of me I cant remember the peace of gear that cap was it but it was a filter and VERY old and I cant forget the cap cause I was shocked at the tolerance spread as well. But even in the 576

The 7A29 was a much better (and newer) amplifier than the 7A19 altogether. Much has been written about that and can be found on TekWiki and other sources. Raymond

On Fri, May 29, 2020 at 04:07 PM, Eric wrote: > > There are 2 fundamental differences that need to be taken in to account when > replacing “vintage” caps. And I use the term vintage loosely. One

If anyone in Southern Arizona is interested, I have a 7904A with two 7A26, 7B92A and 7B70 Plug-Ins. Contact me off list to discuss. Motivated Seller. 73, Dick,

I have a 7904 and a 7934 (obviously different but I believe the PSU is very similar to the 7904A). I find the fan noise of the 7934 becomes a distraction after a while when you are trying to

On Wed, May 27, 2020 at 10:52 AM, LarryS wrote: I thought I had read somewhere the actual figure was 83%. You must be right! larry > > 87% of all statistics are made up on the spot. > :-) > >

They are placed between the rectangular HV ceramic caps in the CRT HV module.

The fan on my 7904A is very quiet, a non issue on mine at least. I suggest that the most important thing will be finding the best instrument available around your location. Packing properly is

Thanks for all the responses. I also hate fan noise. That and more readily available parts make the 7904 preferable. However, I'll also look into the 7854. As I have a Tek 11801 and HP 16702B and

All: Now that I have got my 576 working reliably, I was going to start calibration and I found a pair of what appear to be silicone washers laying in the bottom of the unit. I have no idea where

Bruce, There are 2 fundamental differences that need to be taken in to account when replacing “vintage” caps. And I use the term vintage loosely. One is tolerance. In the worst case I can

I had a 7904A recently for a short time. The fan was one reason I sold it - the noise is obnoxious to me. I don't think there was anything wrong with the fan, but I'm sensitive to that white noise -