Arny Krueger wrote:
THD as speced by the manufacturer is not the only measure of equipment
quality. For example, a lot of the HP equipment would meet spec near
their end of life or the end of life of their tubes. while Heathkit
equipment might meet spec only if routinely maintained.

The HP generators derived from the Model 200 will run forever, or at
least more than one human lifetime. There are no proprietary parts that
are likely to wear out with normal use. If needed the transformers and
the tuning capacitor could be repro'd for far less setup costs than
having a replacement IC taped out, masked and a run made such as would
be needed on many solid state units using proprietary ICs.

Everyone should own and care for one of these things. They were
manufactured until 1986 and represent the antithesis of all that is
wrong, immoral, indecent, and generally ****ed up in the electronics
business today. (And most will run on 220 balanced power with only a
flick of the voltage switch...)