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Old 23rd September 2012, 12:02 PM   #1
diyAudio Member
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Default identify this amp/board please...

Found this in a shoebox wit a dew others from over a decade ago. well, possibly '02-03 at the least, but doubt it. No heatsink yet, but ill keep looking. The terminal attachments look like old school usamps, but doesn't match my 99 200x. components mount vertical,too
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Old 23rd September 2012, 12:21 PM   #2
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How about a pic?
BK 1544 40Mhz scope.....Pyramid PS-26KX supply.....Tenma 72-380 Func. Generator
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Old 2nd October 2012, 06:48 AM   #3
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lol, i tried, and couldn't get it to post pics from my phone. anyways, lets see if i can get them this time. just been real busy with the new baby and fall-catch-up. Click the image to open in full size.Click the image to open in full size.Click the image to open in full size.
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Old 2nd October 2012, 05:40 PM   #4
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Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch
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Old 2nd October 2012, 06:38 PM   #5
amc32 is offline amc32  United States
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Looking at the transformer coupled hi-level inputs, single layer board and self modulating power supply, I would guess this is also a JENSEN from 89'-94'.
...............I Hear in color.................
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Old 4th October 2012, 08:21 AM   #6
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Does it tell you what size fuse is to be inserted since the fuse is missing?
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Old 5th October 2012, 10:45 PM   #7
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no, it does not. i was not able to find a pic of a jenson internals in that era that uses the transformers and has vertical mounted components.. the original parts are mospec bd907/bd908outputs, and i have no idea on the power fets. i'm guessing something allong the lines of irfz42's. possibly i could use some spare "good used" ones i have laying around and see what happens. i also have 44n's and 48v's..

edit: only have one 42, so that's out..

Last edited by AKHeathen; 5th October 2012 at 10:58 PM.
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Old 10th March 2013, 05:53 AM   #8
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Sorry to kick this horse, but I found this searching for something else and I can identify it.

It's an OEM'd amplifier that was used in 'Frontier 70w x 2' which was a brand Sears sold. The Sears model had a 3 pin power PLUG for power. It was also used in a white pyramid amplifier but I forget the model #. That model had the power terminal system on this particular PCB. It was a simple design but was pretty clean. Fuse is 15a and those are NOT the stock parts in the PS.. LOL!

Ok, back to finding what I was searching for.

*EDIT* Found it. Pyramids Legacy division. The LA220 - Legacy LA220

*EDIT 2* Since you're wondering why the end cap is grey, but the frontier was black and the legacy was white: Optimus Amplifier & HERE & HERE - Pyramid also OEM'd radio shacks amplifiers. So while they're all the same, this one you have is probably an optimus.


Last edited by MatthewS; 10th March 2013 at 06:19 AM.
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