I have had my P20 for a few weeks now and am currently trying out these russian sub-miniature tubes. These are 6N18B which have broadly similar characteristics to the 6N3P. These are almost identical to the more widely available 6N16B. So far I am liking the sound of them, bass is all there and...

I have the cloth pads on now and probably about 4 hours total usage. The bass is now definitely better, tightened up and allowing the mid-range to come through more. I think, as has been said previously, more burn-in will help but they are not bad at this stage, no glaring faults.

Yes, I totally agree with that. The bass is overly soft and highs lacking sparkle.

I have just used them for a couple of hours movie watching. Think the bass is getting better or maybe I am getting used to them. Comfort is great, didn't feel the weight at all. I think the soundstage is getting better too. Tomorrow I will try them with the cloth pads. I have been using a...

Yes, early days yet, but the bass bothers me the most. If you play a track with not much bass they sound very good, mid-range is clear and detailed but I would like a bit more sparkle in the highs. But anything with bass in it and it seems to overwhelm the whole sound and sounds fuzzy. I do like...

Received mine today. Just brief sound impressions as I haven't had enough time to get used to them. They sound overly warm. The bass is indistinct and the upper bass shadows the mid-range. The highs are there but not prominent so you certainly can't call these bright. Fairly detailed but...

I got the same message. The photos she sent of the HI 3050 look identical to the HF 580 and the specs are similar but not identical. Maybe some minor changes but I accepted the HI 3050 too.

Just received mine and they are as good as has been said many times before. Got them on Aliexpress from Music HuHu Store ( how do they come up with these names ?) for just over $60 after coupons and that included the carry case. Has to be the best deal at the moment.

Thanks pvico for the schematic. I measured the B+ and it was 185v not 210v. Also, the heater voltage was 11.9v so I don't know if that affects your calculation of the bias current.

Looks like you got an early one with decent components. Lots of Wimas there which aren't bad for a cheap capacitor. Can't tell what you have for the power supply bypass though.   The soldering on the tube sockets looks okay so if you are still getting noise on one channel that goes away when...

Yes, they are the ones but those in the picture are 630v. You only need 250v and they are much smaller so will fit.

If you are going to move the transformer then the case is of little use ( and you would have to lengthen all the wires ). You would be better off getting a tube amp kit off ebay. They cost very little and you can mod them any way you like and then fit a case to suit.   The input caps are there...

This amp isn't really suited to modding because of the cramped case but if you have one and want to mod it then there are benefits in changing the caps and maybe some of the resistors. This is my modded board :     I have changed the output bypass caps to 1uf Mundorf Mcaps, the coupling...

I too have some 6N23P but I don't like them that much. I find the whole 6DJ8 family too analytical and cold. This 6N16G-VIR has a similar sound to the 6N16B but more of the "magic". I don't notice raspy vocals but I am using a ( now quite modified ) LD 3 so that may be the difference. Others I...

Firstly I would like to apologise to Mordy for not replying to his PM he sent months ago. I have not been checking this forum for over a year. You may remember that I was keen on the russian sub-miniature tubes and recently I ordered some 6N16B-VR to add to my collection. When I received the...