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  3. 131879-98156

No Output from left channel on Primaluna Dialogue HP

Was wondering to query the hive mind before I sat down and tried to figure this one out myself.
See if anyone had thoughts on how to go about resolving the issue. 

I lost output from the left channel on my Primaluna Dialogue Premium HP Integrated the other day. 

I hadn't turned the amp on since Hurricane Irma came through. One night during Irma, I had a few power surges that happened. I was worried the tube amp would suffer, despite having it connected to a power conditioner, so I switched my amplification to an older SS amp. Turned the tube amp off, and haven't turned it back on since. 


Well, I finally had time to reconnect everything last night only to realize the left channel has zero output. Right channel working fine. I meticulously identified the amplifier as the cause. 


-I'm not getting any red lights for bad tubes. Despite this, I changed out almost all tubes to confirm. Still no output. 

Anyone have any thoughts as to the source? Fuse blown? Something worse?
Any fixes I should investigate?

Current tubes available are 8 KT150 power tubes, 6 Cifte signal tubes, and all the original primaluna tubes. 

Thanks 



128x128whacky
facten
2,726 posts
 
In the event you don't have an owners manual here's a link to get the one you need  http://www.primaluna-usa.com/owners-manuals/
tablejockey
3,771 posts
 
PL HP owner here.

Couple of years ago, similar problem. Its a relay not functioning. Time to strain your back lugging it to the shop.
pokey77
1,260 posts
 
Give Kevin @ Upscale Audio. He can help you out.
whacky's avatar
whacky OP
53 posts
 
I'm going to spend some time with the amp tomorrow to finally take a look at things.

@imhififan I haven't listened with headphones. If I listen with headphones and it comes through in both channels vs. still has no output via left. What would that tell me? 

I'll take a look at the fuses. Pull out the multimeter. 
Does this thing have two fuses? I guess I will figure it out tomorrow. 

@tablejockey  How did your problem present itself? Single channel no output? Power surge? If you don't mind me asking, how much did the repair set you back?

I didn't buy the amp from Kevin at Upscale Audio (It was a forum purchase), but I have bought about 1.5-2K worth of tubes from him, so hopefully if I can't figure it out on my own, they wont mind me asking them for help. 


Warranty on these amps are not transferable correct?

Thanks
imhififan's avatar
imhififan
2,108 posts
 
@imhififan I haven’t listened with headphones. If I listen with headphones and it comes through in both channels vs. still has no output via left. What would that tell me?
If listen with headphones and it comes through in both channels, the preamp section is fine.

If listen with headphones and still has no output via left, could be problem from the preamp section or the source.

Another way to verify is connect a source with volume control or another preamp via HT bypass (bypass the preamp section).
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