[finubi]

I did not mean the popping sound, I mean electric noise for 5 Minutes, weird. They dont have good qulity control. My first unit had an somehow broken female DC jack but a good potetiometer.

 

[hiroshi976]

Received yesterday. I did some tests. It works perfectly. No pop noise during music I only hear "click/crack noise" when turned it on.
Great sound. This morning I improved the power supply. I installed an EMI filter and change power supply box.
The opamps installed are NE5532P. I'm waiting Mullard E180F for first upgrade.

Do you recommend a combination of OpAmp with these tubes?
thank you

 

[edulov]

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.

 

[hiroshi976]

did you replace them? I have a Sennheiser HD518 and a Alessandro Grado MS1, entry level headphone but good sound (imho)

 

[edulov]

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 "dig" for all posts about compatible opamps in DIP casing. You can try some, but if a descriptions mentions "dark" sound, do not go for that option it you like live instruments and real vocals.

 

[finubi]

Are the tubes amp the sound or are they just preamps?

 

[edulov]

Hybrid. Opamp + tube

 

[hiroshi976]

i have modded and upgrade power supply. I inserted an emi filter. now go much better!

 

[Machiventa]

Hello, is the newer model still considered a decent amp? How do you know which version you're buying?

 

[finubi]

Î think they just replaced the tubes, beside from this it is still the same model.

I found another problem, I think they deliver a power supply with a wrong DC plug.
The right one fits tight and it is slightly shorter.
Is this another DC type or just better quality?

 

[N3v3rmind]

just ordered a my 6j9 amp, a pair of mullards and a pair of LM4562.

Question, when desoldering the blue leds, has the tube socket needs to come off?

thanks,
dan

 

[Slipmyster]

just ordered a my 6j9 amp, a pair of mullards and a pair of LM4562.

Question, when desoldering the blue leds, has the tube socket needs to come off?

thanks,
dan

You should be able to get to the led's from underneath easy enough

 

[JasonFH]

I've been having a lot of fun with this little amp. I think I have the newer version and have some questions on op-amp rolling.

Does anyone know if the two internal op-amps run in series or one for each L & R channel of the output? I picked up some LT1364CN8 opamps (5 actually) and if I replace both of the NE5532 amps with the LT1364CN8, I get a loud and nasty buzz which seems to come from both L & R channels. If I just replace one of the op-amps with the LT1364CN8 and leave one as a stock NE5532 no buzz. No matter which combo I use as soon as both of the op amps are LT1364 they generate an awful buzz. (Tried all 5 of my LT1364s)

Any ideas?

 

[edulov]

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.

 

[TheSands]

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.

Hi,

so what opamps would you recommend? I have Rev. 8.0 of the board HY-A-U808-A. I read some pages earlier that someone replaced them with BB OPA267(?).. Are these fully compatible (I'm sorry, but I'm still new in this field).

Thanks a lot!