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Eidetic GB-1b Power amp help
Eidetic GB-1b Power amp help
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Old 27th January 2021, 05:37 AM   #1
DrDetail is offline DrDetail
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Default Eidetic GB-1b Power amp help

Hi all, I wrote in about a month or so back looking for any information on the Eidetic GB-1b power amplifier, I know Greg Ball seems to be out of the mainstream action at the moment (unless I'm quite wrong!), but I could really do with a full circuit diagram and voltage adjustment info if possible. I have picked up an amp recently that has very high DC on both outputs .. well, I consider 300mV+ on the LC very high and a bit less on the RC. Looks like one of the output trannies has got a bit hot on the board (LC). I will probably replace all caps on the boards, one or two look like they've taken a bit of a beating over the years, the mains switch has been replaced with an el cheap job that's too small for the cutout and I have no idea whether the plug on the back is pulled out for 1-2 ohms and left in for 6-8 ohms or what. No instructions for adjusting DC or bias and those I'd really like if possible.
Anyone got any ideas please? Any help from previous owners would be much appreciated! Thank you.
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Old 13th November 2021, 07:37 AM   #2
ranu is offline ranu  Australia
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Hi,
Are you Sydney based? If so, I have a working Eidetic power and pre-amp (still regularly used) that you could take photos of and measure relevant voltages, etc - provided it doesn't damage my much loved amp.
I'll also look for any documentation that might still be in the box (if I can find the box).
Send me a DM for contact info.
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Old 13th November 2021, 08:08 AM   #3
ranu is offline ranu  Australia
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Update - Sorry I have the Eidetic GB2a and 2b pre/power amps, not the GB1 series. Offer still stands though. Ranu

Last edited by ranu; 13th November 2021 at 08:15 AM.
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Old 18th November 2021, 05:18 PM   #4
mlloyd1 is offline mlloyd1  United States
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Eidetic GB-1b Power amp help
Hey, I'd like to see some pictures regardless.
Any chance of posting some good internal shots?
I believe these were Greg's design that used an op amp driving a MOSFET output stage?
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Old 18th November 2021, 06:21 PM   #5
mlloyd1 is offline mlloyd1  United States
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Eidetic GB-1b Power amp help
BTW, here's a link to comments about the design considerations by the designer Greg Ball when he was around here: Eidetic by Amplifierguru
Some good info, but no detailed schematic in case you are still looking for that.
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Old 25th November 2021, 10:09 AM   #6
ranu is offline ranu  Australia
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Default Photos of Eidetic GB2b power amplifier

Finally was able to take my Eidetic GB2b power amp out of its cabinet and take some photos of its internals.



Photos cover external Front & Rear externally, and internally the Power Supply, Ohm Plug, Power Amp module and MOSFETS (two exposed). There are lots of components on the underside of the power amp module - and I'm not able or willing to dismantle these modules further.
Attached Images
File Type: jpg Eidetic GB2b Front.jpg (1.02 MB, 36 views)
File Type: jpg Eidetic GB2b rear.jpg (1.01 MB, 37 views)
File Type: jpg Toroid and Power Caps.jpg (794.2 KB, 37 views)
File Type: jpg Speaker Outputs.jpg (920.3 KB, 37 views)
File Type: jpg Ohm Selector plug.jpg (991.6 KB, 34 views)
File Type: jpg Ohm Selector wiring closeup.jpg (373.2 KB, 14 views)
File Type: jpg Amp module in situ.jpg (550.0 KB, 17 views)
File Type: jpg Amp module up close.jpg (759.1 KB, 25 views)
File Type: jpg Amp MOSFETS.jpg (725.6 KB, 26 views)
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