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| | |-+  Is my HRM 50 modded?		 « previous next »
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Author Topic: Is my HRM 50 modded?  (Read 3593 times)
Plato
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« on: January 30, 2013, 09:59:18 PM »
Hello,

I recently bought a used OTS HRM 50 Watt (build 2011 by Ceriatone), which works pretty well by now.
When I opened it to install a HRM-bypass-switch, I mentioned, that the environment of tube 1 seemed to miss some parts compared to the schematic offered by ceriatone.

Is this some kind of mod you saw before?

Andreas
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hywelg
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« Reply #1 on: January 30, 2013, 11:15:52 PM »
Looks to me like the two 22Meg local negative feedback R's have been removed, but the cap was left in place, not connected.

One of the later models puts this on a switch which would have been the sensible thing to do.
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Plato
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« Reply #2 on: January 31, 2013, 04:14:21 PM »
What kind of sound-changes would I have to expect, if I tried reconnecting the capacitor and reinstalling the missing resitors?

Andreas
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hywelg
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« Reply #3 on: January 31, 2013, 05:14:45 PM »
Minuscule changes. I have mine on a switch and I would not be able to hear the difference if I was to stop listening for 5 minutes to make the changes.
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Plato
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« Reply #4 on: February 01, 2013, 10:26:52 AM »
Thanks for your help,

this helps to calm down again after getting aware, that parts of my amp were missing.
Anyway - refering to the sound I wasn't missing anything at any time :-)

Andreas
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