Dennis Had Inspire Amps

[PSE45]

Originally Posted by FloridaBoy

I ran the A grade Sophia Blue 6SN7 in my triode strapped amp with a LP27a preamp and a 6BX7. I have not tried any of their other blue tubes.

Do you think you would need the A grade for an amp driver? Also any thoughts on the 30 day vs 1 year warranty? If they are bad do they show their cards in the first 30 days? Really tempted to try in the IIPS PSE.

[oldominion]

Originally Posted by PSE45

Do you think you would need the A grade for an amp driver? Also any thoughts on the 30 day vs 1 year warranty? If they are bad do they show their cards in the first 30 days? Really tempted to try in the IIPS PSE.

FWIW my 6sn7 C grade was bad out of the box...Immediate response from seller in NOVA and easy to replace, though expensive.

[bearcity]

Anyone try a Shuguang 6N8PA? They sure are cool lookin’.

[FloridaBoy]

Originally Posted by PSE45

Do you think you would need the A grade for an amp driver? Also any thoughts on the 30 day vs 1 year warranty? If they are bad do they show their cards in the first 30 days? Really tempted to try in the IIPS PSE.

I bought the A grade with 30-day warranty. No issues.

[FloridaBoy]

Originally Posted by bearcity

Anyone try a Shuguang 6N8PA? They sure are cool lookin’.

Are you referring to the globe version?

[bearcity]

Yes. Looks like it belongs in a mad scientist’s lab. I have had mixed luck with reliability in Chinese tubes and do not want to try this one without a rec.

[FloridaBoy]

Originally Posted by bearcity

Yes. Looks like it belongs in a mad scientist’s lab. I have had mixed luck with reliability in Chinese tubes and do not want to try this one without a rec.

I looked at them too and decided to pass for the same reason. There was a fire near the Shuguang tube factory and it will not be producing new tubes until 2021. There may be a lot of subpar tubes being sold by shady dealers.

[pechelman]

Originally Posted by bwilson51

I have tried multiple 6SN7 gtb nos tubes and current production tung sol,the hum comes and goes I thought I had it solved but I have had no luck.I thought it was issues with my wiring in my home.I just tried an nos tung sol 6sl7 tube and that did not help.I thought of taking the bottom plate off and see if any wires were touching causes this problem.

Originally Posted by bwilson51

I am enjoying my Inspire LP-3.1 preamp with out any unwanted noise or hums and I am a happy camper.I have always enjoyed the sound of this preamp and I just lived with the noise between tracks.Now it is quiet and the sound of my system is outstanding.Now if I just had a remote control.

I didn't notice this before bwilson.
In the first post you said you tried many different tubes with no change but the second a day later you say all the hum and noise is gone. What fixed it for you?

Recently plugged my lp3.1 ultra into a new power amp, with more power than the 45SET Firebottle, and the hum is much more noticeable now. Have tried many different tubes in all positions with little change in hum. It did seems like yesterday I noticed hum decreased as everything came up to temp but was still there. Any tips from anyone else on what I should consider doing? I can solder.

[Bombadil]

Originally Posted by FloridaBoy

. There may be a lot of subpar tubes being sold by shady dealers.

Making it just like the vintage tube market!

[bwilson51]

Originally Posted by pechelman

I didn't notice this before bwilson.
In the first post you said you tried many different tubes with no change but the second a day later you say all the hum and noise is gone. What fixed it for you?

Recently plugged my lp3.1 ultra into a new power amp, with more power than the 45SET Firebottle, and the hum is much more noticeable now. Have tried many different tubes in all positions with little change in hum. It did seems like yesterday I noticed hum decreased as everything came up to temp but was still there. Any tips from anyone else on what I should consider doing? I can solder.

I changed the5y3 to a 5u4 and I plugged the power cord into a quality power conditioner.I use highly modified Klipschorns with Volti horn upgrades with bms4592nd mids and I have to put my head un against the grill to hear a faint buzz.