rdnzl999
Active member
My new (old) KAV-250 arrived today, now driving my old (were new) reQuests.
I popped the top, all looked to be in order, none of the smoke appeared to have already escaped. It has a thin layer of British Columbian dust on it, seems never to have been opened, no paw prints inside.
Moved it into position in the pseudo-audio rack, powered it up, still no smoke. Measured 77w idle (cold), and 0.2 dc offset on the positive output of the right channel.
Power off, hooked up the speakers and RCA inputs, powered it on, and heard an annoying hum in both channels.
Hmmm. Hum. Hmmm. Oh yeah, forgot to short the dangling pin 3 of the XLR inputs to ground. Used a bent paperclip inside one of my new (new) Neutriks (with which I will build a new interconnect). That took care of the hum. Hmmm.
Played some tunes, sounds good. It replaces a similarly aged Acurus A250, which purportedly has some Dan D'Agostino genes in it itself.
Warmed, it draws about 85w at idle (after running with music for two hours). The manual says 210. 95-100w with signal at moderate daytime casual listening levels.
Cold, it had 0.2v dc offset on the negative leg of the right channel (measured to ground). Now that it is warmed up (and the XLR pin 3 is shorted to ground) I see only 0.08v offset max. Don't know yet if the open XLR was causing the DC offset, doubt it.
The heatsinks are warm, both about 102 degrees (F) running in daytime casual listening mode.
Sounds good, waiting for the late night to hear the rest of the magic.
---
Question:
I haven't stared at it real hard, and have no schematic, and no other experience with Krell circuits.
I see two little blue pots in each channel, at R22 and R68 on the "outer" board. There is a tiny screw in the top of each one.
Anyone know the circuits? Got any other hot tips for this old device?
Here's a picture of the board...
http://screencast.com/t/PZPdhkd8AN4C
PS: It has had the fuse changeout per the recall -- bottom -- http://www.krellonline.com/support.html
.
I popped the top, all looked to be in order, none of the smoke appeared to have already escaped. It has a thin layer of British Columbian dust on it, seems never to have been opened, no paw prints inside.
Moved it into position in the pseudo-audio rack, powered it up, still no smoke. Measured 77w idle (cold), and 0.2 dc offset on the positive output of the right channel.
Power off, hooked up the speakers and RCA inputs, powered it on, and heard an annoying hum in both channels.
Hmmm. Hum. Hmmm. Oh yeah, forgot to short the dangling pin 3 of the XLR inputs to ground. Used a bent paperclip inside one of my new (new) Neutriks (with which I will build a new interconnect). That took care of the hum. Hmmm.
Played some tunes, sounds good. It replaces a similarly aged Acurus A250, which purportedly has some Dan D'Agostino genes in it itself.
Warmed, it draws about 85w at idle (after running with music for two hours). The manual says 210. 95-100w with signal at moderate daytime casual listening levels.
Cold, it had 0.2v dc offset on the negative leg of the right channel (measured to ground). Now that it is warmed up (and the XLR pin 3 is shorted to ground) I see only 0.08v offset max. Don't know yet if the open XLR was causing the DC offset, doubt it.
The heatsinks are warm, both about 102 degrees (F) running in daytime casual listening mode.
Sounds good, waiting for the late night to hear the rest of the magic.
---
Question:
I haven't stared at it real hard, and have no schematic, and no other experience with Krell circuits.
I see two little blue pots in each channel, at R22 and R68 on the "outer" board. There is a tiny screw in the top of each one.
Anyone know the circuits? Got any other hot tips for this old device?
Here's a picture of the board...
http://screencast.com/t/PZPdhkd8AN4C
PS: It has had the fuse changeout per the recall -- bottom -- http://www.krellonline.com/support.html
.
Last edited: