Hello from Yorkshire

Welcome. 

What kind of issues are you having out of curiosity? Also, how many hours are on your cartridge?

It may also be helpful to state what turntable and speaker amp you are using.

I think the loaner program is a great idea, but you just want to make sure that any issues unrelated to GS gear are sorted out before you start your listening trial.

Thanks to all who have posted responses to my first post on this forum.

The symptoms are rather strange but I think I have isolated the problem to the pre amplifier.

My system lost a lot of detail in the treble area as though the speakers had been covered by a blanket.

What made me think that this is due to an electronic problem rather than the cartridge is that this seemed to have occurred between listening sessions. I tried feeding a signal from an old cd player into the line amplifier and the sound was as expected. I then decided to power off the black cube for around 48hrs or so and then powered up again before another listening session. The sound went pretty much back to normal during around half an hour of listening. I left the black cube powered up then during the next session a few days later found that the sound had once moor lost detail.

I do have an electronic background as I used to repair audio amplifiers for a long since defunct company back in the 1970's. I checked the DC voltages from the black cube +15 -15 V external power supply and measured +15 and -14.8 volts wrt the 0V rail. This seemed OK to me. I had a look inside the black cube for signs of any leaking electrolytic capacitors, but all looked OK. I couldn't pursue the problem any further as I now only have a DVM. Lehmann do offer a repair and upgrade service but thought that it is perhaps time to look for a better pre amplifier as I believe the black cube never really managed to extract the full potential of the Lyra Kleos anyway.

So my theory is to try the Accession MC which I believe will solve my problem and improve the sound of my system as an added bonus.

I fitted the new Lyra kleos in October 2022 and will have no more than a hundred hours on it.

My system line up is as follows,

Turntable

Roksan Xerxes 20 Plus with Artemiz arm and Lyra Kleos

Amplification

Sugden LA-4 Line amplifier

Sugden SPA-4 power amplifier

Speakers

Harbeth 30.1

The Sugden power amp is costly to use being class A, but it does keep my listening room warm in the colder months!