Models which I guess will be good for general purpose and with 50+Mhz bandwith - for me :
Tek 2213A,2215A
Tek 2235
Tek 2225 - interesting model, why it appeared if there were 2213A,2215A in the same specs ?
There are 3 major series of 2 channel 22xx oscilloscopes:
- 2213 and 2215 - 30pF inputs, 60 MHz maximum. The early power supply for this series was problematical. The modified power supply is almost identical to the 2235 series power supply.
- 2235 - 20pF inputs, 100 MHz maximum, improved switching power supply, many models including 2213A, 2215A, 2230, 2232, and 2236. These replaced the 2213 and 2215.
- 2225 - 25pF inputs, 50 MHz maximum, line frequency transformer isolated switching power supply, 500uV/div sensitivity, single sweep only with no delay.
And I dont understand why Tek 4XX so popular. It is older and much heavier.
Except for the 485, they are easier to maintain because they use linear instead of switching power supplies.
The 454, 454A, 475, 475A, and 485 have higher bandwidth than any of the 22xx oscilloscopes. The 475, 475A, and 485 may have a brighter and sharper CRT than the 22xx oscilloscopes.
The oldest in this series, the 453, 453A, 454, and 454A have no custom ICs or hybrids.
The 465B and 485 have alternate dual delayed sweep. Most of the other 4xx oscilloscopes have mixed sweep which is not as useful.
The 50 MHz 455 and 100 MHz 465M are ruggedized models which use an easier to maintain internal arrangement. Unfortunately they have mixed sweep instead of alternate sweep.