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Hi Dave, Was the replacement CRT a new CRT? If not new how do you know it was any good in the first place? Dennis Tillman W7PF <SNIP>

Dave, Yes, I believe that this is exactly what you are experiencing. According to the Service manual, replacing the CRT will require the Storage circuit to be adjusted to match the characteristics

I have a 577 D1 that came with the original but weak CRT installed and a replacement CRT in a box. Storage mode on the original weak CRT worked well, but the primary trace was almost too dim to see.

Hi DW, I have a 577 D1 which has similar behavior but not as bad as you described. There is an adjustment procedure in the service manual that will, in theory, bring the storage back into proper

I would certainly check that the store/non store switch is actually latching and unlatching properly. This may seem obvious, however, I have seen many of these type of switches that were gummed up

This 577 is a D1 version, the ability to temporary hold display information in a analog format which is actually quite neat. This feature appears to be fully function when I want to use it, the

Max peak volts 6.5 Series resistors 0.12 Horzi V Division 50mV Vert I Division 0.2mA Collector voltage 0V 100 ohm Resistor across Collector Emitter With collector set to AC and switch set to neutral

Matti, The only battery I know of in the TDS-5104 is the cmos back on the PC mother board. If you don't have the maintenance manuals from the TEK website get them. There's 1 screw on the top cover

groups.io doesn't currently provide a way to change that, so you would have to use User CSS. Or maybe it would be worth asking groups.io to provide a high contrast setting.

Indeed it was text not test. I am referring to the web site message subject header. it shows as a very light blue on my monitor and no amount of fussing with gamma, rgb settings, contrast or

I have good photos of some spare boards taken from partly working 7633's and 7613. They're on auction site sale pages -- item no. 293357893506 and "see other items by seller cibolo". Tekscopes

First, if the DAC output (J119,pin 13) moves smoothly when you turn the delta control, from about -1.25V to +1.25V, the DAC is likely ok. Second, if the -1.25V, and +1.36V, which can be found on most

That 7613 seems quite overpriced to me. If all you want is to use a 7A22, and you already have a working scope, forget the 7000 series and buy an AM502 plugin and a TM500 mainframe. It will be

Hi All: Some readers of this thread thought my last post was incoherent. (That is a failing I have been accused of!) My (Dec 3 #162038) post was in response to Michael Lynch's (Dec 1 #161987)

Brad, What instrument were these intended to fit? Photo please. mlynch002atGMAILdotCOM -- Michael Lynch Dardanelle, AR

Hello-- I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved surfaces and black cursor markings which contrast nicely with the aluminum knob material. The top knob

So, should I try to replace the U305? Or does the problem seem to be somewhere else?

I believe that you are asking about ESR, but absent a quote from the post you are responding to, I can't be sure. If you are asking about ESR, of course it applies to all capacitors. Generally, all

Hi Bruce, I agree with Trevor. Unless you need storage the 7603 is a better choice for many reasons: * It is the most common mainframe sold so there are lots of them available which means their price

Hi Hal and Raymond, Tantalum specifications clearly indicated that surge currents had to be avoided. It is rare in my experience that this was taken into account by engineers. Tek did observe this