So yeah, I wondered about that also, but chalked it up to an undocumented design change somewhere along the line.Īnd yes, they are germainum, as are the NTE 121s which cross reference. The schematic/parts list indicates 35524 in four of the eight sockets, but all eight of mine are clearly marked 35144. So, I guess my questions to the group are:ġ) Does anyone know which RCA type the TR35144 part number actually corresponds to? You know, 2N.something or another?ģ) Would NTE transistors in the output stage really be that bad, or is their reputation a result of undeserved online lore? I'm sure they're an RCA type 2N something or another, but I can't find anything to tell me which type that actually is. Problem is, despite searching online and through a 300-page RCA semiconductor databook from 1966 at the local library, I can find no reference whatsoever to actual specifications based on the "TR35144" number. What I'd like to try to do is find some NOS or even straight-up used transistors that would have specs close enough to the original parts so as to be a decent substitution. Of course, the NTE option is expensive ($22 each x 8), not highly regarded among the online communiity for some reason, and might not even be the optimal replacement, purely from a specification standpoint. From everything I've read online, the "TR35144" RCA part number printed on the parts and in the service manual is cross-referenced to NTE-121. I'm looking at a plastic baggie full of shorted output transistors from my Fisher 690-A 'hybrid' chassis (tube pre-amp/driver, transistor output), and wondering what the best strategy for replacing them might be. I posted this in the 'Fisher' forum, but got to thinking this forum may be another good alternative. HP Replacement Parts and Supplies 1973-1974 (35.Hey folks.Miller, AA4DF (22.9M PDF) ( Text Version) HP Replacement Part Cross Reference From Ralph D.HP Manufacturers Code Number Cross Reference.For example, if the service manual describes the device being replaced as a "dual J-K flip-flop," check this against the description of the replacement part. While every attempt was made to ensure the accuracy of the list, it is advisable to compare the description of the device being replaced with the description of the substituted part. Even though the cross-reference only lists one manufacturer, there may actually be several approved sources for an HP part. To help you in these situations, here's a cross-reference of HP integrated circuit part numbers to manufacturers "generic type" part numbers (whom in most cases is the originator of the part). Perhaps an HP part could be ordered and installed at some later date. In these cases it may be worthwhile to see if a substitute part will work in the circuit. There may be situations however where HP replacement parts are not in stock and substituting parts will allow you to return the product to service immediately. Therefore, we suggest obtaining replacement parts from HP to maintain the quality that you have paid for in your instrument. In some cases special quality checks are employed to ensure that high reliability parts are used at the factory and at HP field offices. There may also be slight mechanical differences, such as the shaping or length of leads. While some parts used in HP instruments are identical to that which can be purchased at a local electronics distributor, many times parts will be selected for certain characteristics, such as gain, bandwidth, capacitance, etc. It is recommended that HP replacement parts be used to ensure that the original performance of the product will be obtained. Service personnel often ask why only HP part numbers are listed. When selecting replacement parts for your HP products, you may notice that many manuals list only an HP part number for the part, even though it appears that this part is manufactured by one of the large semiconductor manufacturers. Hewlett-Packard Part Numbers to JEDEC Numbers Hewlett-Packard Semiconductor Cross Reference Hewlett-Packard Semiconductor Cross Reference
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