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.

Safe - yes. The difference is not that huge to damage, but keep listening noisy music? :triportsad: There is a small possibility that power unit isn't OK, providing lesser or higher voltage. If you have a tester or can lend it - make a check. BTW, twice I had an issue with a bad contact in a...

About opamp noise 1. Valve and opamp are connected in a very specific way in this amplifier 2. Opamp is not jaus a packaging. It has its internal scheme (a specific pin assignment) and electric parameters When I made an opamp rollup, I looked for compatible devices with specific sound profile...

Thanks for sharing your experience. I'd love to propose a small test, but for shure it happens in really good open cans. Look for a losless Uriah Heep - The hanging tree. Best of all - some reissue/remaster, like the "It was 40 years ago" album. There in many places you must hear not just a good...

Warming up is happening for valves, but normally we are talking about 15 minutes max after swithing on. Measuring by ear is not a good idea actually. Download RMAA, they implemented realtime amplitude measurement for L/R, so you can see levels on the go.

Most probably (99%) a disbalance resides in slightly different (or even not so small) REAL electric specs of the tubes. It happens even for the NOB's, not even speaking about a weared second-hand. That is why many people pay extra for selected pairs, since a special testing device measures a set...

This tiny guy can kill your ears even in 600 Ohm cans. That is why some people were crying that it lacks gain switch to deal with low-high ohm headpnones w/o touching volume button,

Just a comment about Burr Brown's compatible with this amp. They produce a darker sound. Not so accentuated, but I prefer neutral sound right from the gear.

Thanks. Still the same version. Think about rolling op amps too. You can find recommendations on head-fi. 5532 are old, but actually sound very good. Potentially you can improve lors, high trebble and resolution. But it will be heard in a really good cans only. BTW, a better soundstage...

Hi. On the recent buy. Can you open it and look which op amps are installed in latest shipments? I'll explain my interest afterwards. Thanks in advance

As far as I recall JEP - USA made, PQ - Holland made. So their real electric specs could be slightly different. JAN - is a military grade long life version.