[sdiy] OT: Rock amp question

[Veronica Merryfield]

It might be a bass amp.

On 2011-08-20, at 11:31 PM, John Alex Hvidlykke wrote:

> Another, slightly off-topic, amplifier question, that I hope this
> knowledgable company can solve:
> 
> Yesterday, I picked up a vintage instrument amplifier at my local boys
> scouts sale: A Rock Amp Petros I combo amp.
> The amp is in fairly decent condition, considering its age (late 1970's is
> my guess) and the price of 15$. The toolex in the bottom needs to be glued,
> and some metal corners are missing.
> 
> I have seen another Rock Amp Petros I many years ago, back in high school,
> and I have also seen several mentioned on the net. However, this one is
> radically different. The others were equipped with 10" speakers and had
> several controls for distortion, tone shaping and reverb. 
> (Like this:
> http://www.guitar-museum.com/guitar-46612-VINTAGE-ROCK-AMPLIFIER-COMPANY-PET
> ROS-I-AMPLIFIER)
> 
> My Petros I, however, only has a volume control (another volume pot on the
> back for external amplification). Nothing else. And it is slightly bigger,
> equipped with a 12" driver in a bass reflex cab.
> 
> Does anybody know of this amp (or of Rock Amps in general)? I only know it
> was made in Pomona California.
> 
> It looks like this (sorry for the lousy mobile shot, my SLR is on a trip,
> must now):
> http://www.rumourcontrol.dk/rockamp2.jpg
> http://www.rumourcontrol.dk/rockamp1.jpg
> 
> The back plate reads 150 watts power consumption. It seems the 10" version
> of the amp had a 5 watts amp. But not even a pure class a amp would be that
> ridiculously inefficient?
> 
> Cheers
> John
> 
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