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Old 20th March 2012, 11:01 PM   #11
tvrgeek is offline tvrgeek  United States
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Yea, that's the problem with the "good" amps. They are all old enough to need their electrolytics changed. About 7 to 10 years max unless abused. The 840 sure is worth it though. I prefer it to my Creek, and compared to the NAD, well, lets just say I prefer the Rotel. Newer caps give the opportunity for lower ESR, which is no bad thing.
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Old 21st March 2012, 12:43 AM   #12
Pingrs is offline Pingrs  United Kingdom
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Strangely, my manual shows a reading of 2.5mV between TP1 & TP3 (TP2 &TP4) after the suggested warm up of 50W into 8Ω, but adjusting to this figure showed high levels of crossover spikes on the distortion residual on my THD meter. At 10kHz and 50W into 8 Ω, I found that when I adjusted VR601 (VR602) so that the the crossover spikes were minimal, the bias readings were around 3.5mV.

Brian.
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Old 21st March 2012, 06:06 PM   #13
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Quote:
Originally Posted by Pingrs View Post
Strangely, my manual shows a reading of 2.5mV between TP1 & TP3 (TP2 &TP4) after the suggested warm up of 50W into 8Ω, but adjusting to this figure showed high levels of crossover spikes on the distortion residual on my THD meter. At 10kHz and 50W into 8 Ω, I found that when I adjusted VR601 (VR602) so that the the crossover spikes were minimal, the bias readings were around 3.5mV.

Brian.
Brian,

There seems to be several versions of the amp that was produced. It does not surprise me at all that your manual has different values stated in the specs. I have been thinking about giving mine a new cap job due to the age of the unit.

However, my last recap was on my Optonica SM-4646. Although it did make it a better unit overall it seemed to change the sonics and that was a change that I am not sure I care for. No one else may notice the difference but this was my favorite amp that I have listened to for many years. I just don't want to have the same regrets with the 840.
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