There have been some discussions about creating a database containing reference information regarding the linear power supplies produced by Power Designs, Inc. Please see the original thread on the topic for background.
https://www.eevblog.com/forum/testgear/looking-for-goodinexpensive-bench-power-supply/While the original thread was largely focused on the "precision" models, there is considerable interest in the forum in tracing out a better history of the company. To this end, we are asking for the contributors to the original precision thread, as well as those who have yet to contribute, to provide information about their units that we can collate. Barbouri's model in the prior thread was a good one, as he included the serial numbers, the geographically-tagged logos, and preponderance of the dates of internal components, as well as other pertinent information. If you have a variant that doesn't look like the other pictures, we want to know that also; some of them have been repaired and/or modified, some are actual factory production variants, and the latter distinctions are likely important to putting together the pieces of the PDI puzzle.
Here's the format Barbouri used in the prior thread, and I think it's a good one to emulate, but of course the info is good any way you wish to provide it:
Model Serial # Component Date Status Location Logo Other
6050D 803035 1987 Operational Westbury, NY pd Full re-cap
6150 410074 1984 Operational NY / CA pd Partial re-cap
2005A 906027 1969 Operational Westbury, NY pd Replaced C3
6050C 705017 1987 Operational Westbury, NY pd Modified display, replaced C8
6050C 705038 1987 Operational Westbury, NY pd Modified display, replaced C8
C500 605008 1985 Operational Westbury, NY pd Original caps
In the last thread some of the schematics were dated and from those we can also deduce when manufacturing may have begun for a given model. Another helpful piece of information might be the older cal stickers on the instruments, as we can then narrow down the individual date of manufacture further. Finding out how long some of the units were in production may be difficult, partially because there are so many variants even among models with the same designation. I am including all the models referenced in the prior thread below and current listings on auction sites, although they are not in chronological order yet. This temporary layout is so you can easily spot a model you own that isn't listed, is incorrectly listed, or needs to be added.
Precision Models
1001A
1025P
2005
2005A
2005P
2010
2020
2020A
2020B (vertical variant, plastic enclosure variant, meter variants)
2040A
4010
5020
5020A
605
C400
C500
Regulated Single Output
1010T
1210-S
1515
1515A
1515B
2015R
2050
2100D
2525
3206
3240
36100R
3650
3650R
3650S
4005
4010 (not precision model, but same model number)
4020
4050
4050D
5005
5005R
5005T
5015
5015A
5015D
5015S
5015T
5030
6010
6010D
6020
6050
6050A
6050B
6050C
6050D
6150
6150D
Regulated Dual Output
TW1550
TW1570
TW2525
TW2860D
TW347D
TW4005
TW5005D
TW5005R
TW5005T
TW5005W
TW5015
TW6050A
TW6050D
Regulated Triple Output
TP1500
TP1800
TP325
TP340
TP340A
TP343
TP343A
TP343B
High Voltage Output
1556B
1570
2K10B
2K20
3K10B
HV-1545
HV-1547
HV-1579A
Your additions and corrections are greatly appreciated, and I will soon be adding the relevant information from my own units to this thread.