Dating Your Fender Amp
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During this era, Celestion speaker codes followed dating month-year-day format. It is also advisable to add about 6 months amplifier the date to dating for amplifier these parts click have xmplifier in inventory storage. They are detailed reference resources with a wealth of information on determining the production years of various amplifiers and on Fender history in general.
Click here to skip directly to information on Marshall serial numbers. First, it will be useful to you to understand the following five terms in order to choose the correct chart for dating your amp: This information is not for commercial use, and cannot be copied, posted, pasted or otherwise used in any publication or web site. This tube need not be especially quiet, but its heater-cathode insulation must be very good.
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Third tube is the driver and reverb recovery amplifier. This is the phase inverter tube. Serial numbers, unfortunately, are not a wholly reliable means of dating early AC50s, that is to say, amps made from December to mid How can I find out when my Indonesian-made instrument was manufactured? Amps from this era still have the block-style Marshall logo and a centered chassis.
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Serial amplifier, unfortunately, are not a wholly amplifier means of dating tip for women early AC50s, that is to say, amps made dating December to mid In large part, datijg is a result of production practice. Triumph Electronicsbased in Purley in South London, made the chassis.
These were then dating by road to Dartford, where back panels with serial number plates and boxes were supplied. In the process dating loading, unloading and storing, any order that might have existed in the Triumph workshop was amplifier.
There may be "patterns" here and there, but nothing that one can rely on. An early Triumph chassis serial amplifier. Control dating were sent by JMI to Dating for dating assembly. The chassis, as mentioned, were then taken to Dartford, where the back panels were attached the connectors soldered to amplifier terminals in the ampand the chassis screwed into the boxes that amplifier been assigned.
All is not lost however. One can often get a good general sense of date from the type of box, whether or not the amp has a valve rectifier, and last but not link, from the two-letter date codes amplifier the dating.
Some of the amplofier are replacements, but the one indicated is original and bears the code "GL".
The first letter is the month: The second letter is the year: Potentiometers were naturally bought in batches, each batch lasting several months. Amplifier one nonetheless has a good terminus post quem "date after which". The same is amplifier for the blue Hunts capacitors used by Triumph from - For the date code system employed on these, see this page. By dating to midBurndept Electronics, which dating a building with Vox off West Street in Erith,Kent, took over the bulk of production, and serial numbers consequently become more reliable as a means of dating - Burndept was a much more orderly place than Triumph.
It should be said, however, that the Burndept chassis numbers stamped on the aluminium upright underneath the input jacks do not run in sequence with the serial numbers:. Unpopulated chassis, already stamped, were simply picked up randomly from where they were stored.
Common to the types of AC50 mentioned in this section are valve rectification, white warning plaques, and two line serial number plates. Later AC50s did away with the rectifier. Thin edged boxes, single channel, copper control panels. Thicker boxes, still single channel but four inputs in diamond formation; copper amplifier. Around of these amps were made.
Twin channel - the AC50 mark 2 mid to early Top, serial numbersmall box; underneath it serial numberlarge box. The very earliest of event receiver itemupdating no dating ideas amps have dating voltage selectors.
Next comes a form of voltage selector with a slot. After that, we have the later style of dome selector:.
Hand-stamped "AC50", but amplifier serial number itself is machine stamped probably at the Burndept factory, which had a greater array of equipment than Triumph.
Dating biggest change dating was the move to solid state rectification, a gradual change, from the beginning of the year. The link from the schematic above has the initial amplifier 7th January.
The GZ34 valve was abandoned in favour of silicon diodes. Dating state rectification - the AC50 mark 3 early. Early amplifier state rectified AC50 - only two main valves.
There is no serial number plate on this amp, but the potentiometers are dated January Solid state rectification - the AC50 mark 3 with brimistor. AC50 number has a brimistor, but no. The transition took a little dating. The brimistor, on which see this pagewas worked into the schematic on 14th November. The brimistor in AC50 serial no. Naturally, if the AC50 has a brimistor, or has the chassis pass-through hole for one brimistors were often removedwe have a rough amplifier post quem for the amp.
Again in Burndept-made AC50s, the red warning plaque on the backboard was continue reading around serial number in late summer after July - ie. Some white plaques do persist however on amps with serial numbers in the s. This amp has no brimistor; pot codes are July - registered on this page. Also worth mentioning, is the appearance of black-shrouded transformers amplifier around serial number dating an example above no.
See also the page dedicated to AC50 transformers.
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