Solo ultra linear diamond edition.
Printed From: Graham Slee Hifi System Components
Category: Headphone Audio
Forum Name: Graham Slee Headphone Amps
Forum Description: Questions, answers and product information zone for Graham Slee Headphone Amplifiers
URL: https://www.hifisystemcomponents.com/forum/forum_posts.asp?TID=5795
Printed Date: 27 Mar 2026 at 4:02am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: Solo ultra linear diamond edition.
Posted By: Proffessa
Subject: Solo ultra linear diamond edition.
Date Posted: 05 Mar 2025 at 12:38am
| Hi folks, my name is Henry and I've recently acquired a solo ultra linear diamond edition with the linear power supply. It's a stunning amplifier.. Props to Graham. I'm listening to it on original sennheiser hd600 and running her from my fiio ka17 dongle.. I'm planning to get a proper dac soon (I was looking at one of Rob Watts's offerings.. Need to save some pennies first). Everytime I listen to the amp, the word that comes to mind is pristine. The stage is excellent. Even with the hd600. It kinda pushes out the close-in three bob hd600 stage lol. Crystalline clarity and complex shape to the sound. I was wondering about the circuit. What class is the topology? I took the lid off to have a look and noted a massive potted op-amp and 4 transistors. Is she class A or AB? Is the op-amp a proprietary discreet? Thanks. I love this little thing xx |
Replies:
Posted By: CageyH
Date Posted: 05 Mar 2025 at 8:18am
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Most of your questions are answered on the product info page. ------------- Kevin European loan coordinator, based near Toulouse, France. Funkified SL1200 Mk.II, BB3, Firebottle Kin , ADI-2 DAC FS, Modulus 686, PD-S703, Solo UL, Triangle Antal EZ |
Posted By: Proffessa
Date Posted: 05 Mar 2025 at 11:20am
| Cheers CageyH, I just took a look. Class AB. Op-amp looks like a bar of chocolate lol. Xx |
Posted By: Proffessa
Date Posted: 07 Mar 2025 at 12:15am
Right, some further reading done. Am I correct in saying the op-amp is a modified dual jlh 1969 class A circuit? The reason I'm asking these questions is so I can tell my friends why it sounds like it does  . Cheers boyz xx
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Posted By: CageyH
Date Posted: 07 Mar 2025 at 5:34pm
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No idea. I have never taken the lid off. ------------- Kevin European loan coordinator, based near Toulouse, France. Funkified SL1200 Mk.II, BB3, Firebottle Kin , ADI-2 DAC FS, Modulus 686, PD-S703, Solo UL, Triangle Antal EZ |
Posted By: Proffessa
Date Posted: 07 Mar 2025 at 6:13pm
| Tbh there's nothing visible about the op-amp as it's potted.I was just interested in the topology. It's an amazing piece xx |
Posted By: Fatmangolf
Date Posted: 07 Mar 2025 at 6:49pm
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I would expect the op amp to provide the voltage gain and drive the output transistors which are probably class AB. If they are hot without music, maybe class A. ------------- Jon Open mind and ears whilst owning GSP Genera, Accession M, Accession MC, Elevator EXP, Solo ULDE, Proprius amps, Cusat50 cables, Lautus digital cable, Spatia cables and links, and a Majestic DAC. |
Posted By: Proffessa
Date Posted: 07 Mar 2025 at 7:06pm
| Yes. In the spec's CageyH pointed to, the amp is stated to be class AB in operation. I read an article that mentioned the ULDE, linked to the jlh 1969 class A circuit. I read a fair amount of Grahams posts, talking about the jlh class A circuit and it's use (or similar) as the output in the NE5534 chip. I wondered if that very topology was, in fact, heading up the ULDE... obviously supported by a push pull set of transistors afterwards xx |