Hi Decided to put some life into this old thread. My playlist is quite long, so look at it directly in my blog. Do not afraid of russian header, playlist is a playlist. There are only a couple of native musicians, but all these tracks serve the same purpose - HiFi testing. The only warning goes...

Hi I had the same problem with LT's, since their electrical params are not the same as NE. They are compatible, but not fully.

Hybrid. Opamp + tube

Overall good cans, but Sens won't give you enough highs and are not very good for soundstage, MS1 are tuned, good sound stage but can not provide enough lows to hear all tube rolling change. But with MS1 you will hear all opamp improvements in mids and highs. Recon to give you a pair of days to...

Lot of people will appreciate only this change, since installing better opamps will add details in general and improve "high" highs. Slightly widen a sound scene. But to hear these changes, you'll need really good cans. Since your profile does not include information, I can not tell.

look at your first. I placed my IMHO or in this thread, or in other one dedicated to this amp.

If you need "safe" options w/o paying too much, order any or Mullard/RCA/Amperex. This amp also benefits from opamp upgrade, but you have to see which ones you have first, may be they already installed better ones? About power supply, look for any with the very familiar specs, +5% max. There are...

About audio jacks. Mine are fine, even being cheap. But, as noted many times for many equipment and cans, audio cables make difference, in case of this amp you need good ones for input and output. You can save some money buying HiFi microphone ones. Use the same HQ cables & hardware, but are...

Sorry, forgot about Amperex. Definitely a good ones

Nope. You need these https://www.ebay.co.uk/itm/MULLARD-EF94-6AU6-NOS-VALVE-TUBE/192782311934?hash=item2ce2b8a1fe:g:ce4AAOSwm5xcMjbI:rk:1:pf:1&frcectupt=true

Hi. No to your question, but officially 6Ж3 was replaced by better 6Ж4П (6AU6). It is one detail to look for compatible valves. The other one that looking at direct analogues 6AG5/EF96 and general behavior knowledge look for Mullard, RCA first. Then - Russian ones. If you like leaner sound but...

Yes, it will damage the unit. Valve is a 6.3V unit. OpAmps must use recommended 5-15V, so if you WANT it won't be harmful to use 6.5V with the same current as a stock PSU does.

6V plus/minus a little. Slightly higher is better if you can't find a good 6V adapter.

The plugs of some cables could be disassembled and you will find a really bad soldering quality. Talking about Nob, its In/Out connectors are "deepened", so some cables could not be completely inserted, causing different sound distortions - I had this issue.

I hope we agreed that testing a completely different pair of bulbs may give a hint. It would be very rare that BOTH opamps came with the SAME ISSUE.