Transistors that replaced Nuvistors

mmerig · 7th June 2005, 06:32 PM

My Tektronix 453 seems to have a problem on it's sweep generator board. I have checked all of the transistors on it, and most seem okay but two. These two were nuvistors (8393) in an earlier version of the 453, as indicated by the manual. The serial number is 41351. My manual has corrections going up to SN 13820.

But these two transistors have different part numbers and I cannot cross them with a modern number.

The transistors are Q533, with a "6937 1511005 " stamp, and Q443, with a "6952 1511005 " stamp.

The transistors may be okay, but for each one, I get very different B-E and B-C readings at a given charge polarity.

Any ideas?

Netlist · 7th June 2005, 09:34 PM

You might find some help here:
http://antiqueradios.com/forums/Forum8/HTML/001837.html

/Hugo

mmerig · 7th June 2005, 11:20 PM

Thanks, Hugo. That site looks very useful, and I may be on the right track (the FETS that replaced the nuvistors were not very reliable).

jackinnj · 8th June 2005, 02:10 AM

if you want a really good answer, post to the usenet group rec.radio.amateur.homebrew -- these guys really know their stuff

7th June 2005, 06:32 PM	#1
mmerig diyAudio Member Join Date: Jan 2005 Location: south east Idaho, Teton Basin	Transistors that replaced Nuvistors My Tektronix 453 seems to have a problem on it's sweep generator board. I have checked all of the transistors on it, and most seem okay but two. These two were nuvistors (8393) in an earlier version of the 453, as indicated by the manual. The serial number is 41351. My manual has corrections going up to SN 13820. But these two transistors have different part numbers and I cannot cross them with a modern number. The transistors are Q533, with a "6937 1511005 " stamp, and Q443, with a "6952 1511005 " stamp. The transistors may be okay, but for each one, I get very different B-E and B-C readings at a given charge polarity. Any ideas?

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7th June 2005, 09:34 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	You might find some help here: http://antiqueradios.com/forums/Forum8/HTML/001837.html /Hugo

7th June 2005, 11:20 PM	#3
mmerig diyAudio Member Join Date: Jan 2005 Location: south east Idaho, Teton Basin	Thanks, Hugo. That site looks very useful, and I may be on the right track (the FETS that replaced the nuvistors were not very reliable).

8th June 2005, 02:10 AM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	if you want a really good answer, post to the usenet group rec.radio.amateur.homebrew -- these guys really know their stuff

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