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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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23rd Nov 2019, 10:32 pm | #1 |
Triode
Join Date: Jun 2013
Location: Stratford-upon-Avon, Warwickshire, UK.
Posts: 18
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Rock-Ola 451 Selection Control Box diode identification
Anyone familiar with the Rock-ola selection control box circuits please?
This diode was soldered to tags of a circuit connection strip (photos attached). It measures around 600K in forward direction so suspect may be a zener? Can't tell from markings if it's an IN301 or something else. I paid for service manual but that only has parts list for the audio amp, so I'm too cheap to pay more for comprehensive parts list in case any expert here can help identify. The jukebox is working fine without it now I've degreased gripper mechanism. I'd like to replace this diode but dropped it into bowels of machine. Please can anyone help identify the diode to get hold of? Thanks a lot. |
24th Nov 2019, 1:00 am | #2 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: Rock-Ola 451 Selection Control Box diode identification
Difficult to see clearly, but is there a figure 1 after the 1N. If so it could be 1N1301
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24th Nov 2019, 11:55 am | #3 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
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Re: Rock-Ola 451 Selection Control Box diode identification
Package is wrong for either 1N301 or 1N1301.
What were you trying to measure Vf with? Some larger diodes can go over a volt. Package looks similar to 1N5400 series. Pity it's buried in the innards- some better pictures might be a bit more informative. Any idea of its function? Could it be a relay back emf suppressor or similar?
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24th Nov 2019, 12:08 pm | #4 |
Rest in Peace
Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
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Re: Rock-Ola 451 Selection Control Box diode identification
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24th Nov 2019, 12:47 pm | #5 |
Heptode
Join Date: Jan 2008
Location: Sheffield, South Yorkshire, UK.
Posts: 656
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Re: Rock-Ola 451 Selection Control Box diode identification
I have had a look at the selection control schematics for this juke box, and while the diode part numbers are not given, they all appear to be standard silicon types. I guess a 1N4004 or 1N5404, or something similar would be fine.
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Martin BVWS member GQRP Club |
24th Nov 2019, 2:59 pm | #6 |
Triode
Join Date: Jun 2013
Location: Stratford-upon-Avon, Warwickshire, UK.
Posts: 18
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Re: Rock-Ola 451 Selection Control Box diode identification
Thanks for all the helpful replies.
From it’s position on the tag strip, it is very likely it was for back emf protection. All the jukebox functions and selection operation are perfect other than the usual dried grease. I’ll pop in an IN4002 or IN4004. Adrian |