Re: Tek 2215
On Sun, 24 Jan 2016 23:02:56 -0600 (CST), you wrote:
On Sun, 24 Jan 2016, David @DWH [TekScopes] wrote:I only have the later 2230 and 2232 models and Tektronix used filmOn Sun, 24 Jan 2016 22:11:50 -0600 (CST), you wrote:So far I've done 3 but I might rebuild one or two more 22xx scopes if IOn Sun, 24 Jan 2016, David @DWH [TekScopes] wrote:Lol. How many 22xx oscilloscopes are you rebuilding?On Sun, 24 Jan 2016 18:56:02 -0600 (CST), you wrote:That's what I'm planning to install. I picked up 100 VishayOn Sun, 24 Jan 2016, jasontucker70@... [TekScopes] wrote:The Vishay VR25 and VR35 series high voltage film resistors are very
resistors for the focus resistor chain in them.
I would have expected there to be a clean cutoff date for when they
changed resistors in the focus resistor chain but that apparently is
not the case. The 2235, released in 1984, used carbon composition
resistors but the 2236 which was released at the same time used film
resistors and the 2213A and 2215A which were released later, both in
1986, used carbon composition resistors.
There was another resistor change Tektronix made and I think it was
for reliability. The 2213 and 2215 use two 1/2 watt 1% metal film
resistors in series for the collector loads at the output of the
vertical amplifier. These resistors run hot making them unreliable
and were the first 2213/2215 repair that I made and I know of two
other instances where they had to be replaced. The later models used
3 resistors in series for each collector load to distribute the heat
The collector load resistors are not difficult to replace so I would
change them also.