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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 22nd Sep 2019, 9:33 pm   #1
Goodizzy
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Default Rogers Ravensbourne amp restore

Good afternoon,

I have acquired a "working" Rogers Ravensbourne amp after being bit by the collector's bug. I have a few other amps from the era and love these early transistor designs!

Before plugging it up to the variac, I've been cleaning it with a dry brush and blowing the dust out with compressed air. (It was dirty!) The amp appears to be all original. (to my eyes at least)

I have a few questions I'm hoping you guys could answer-

- The amp didn't come with a wooden case. I've taken off the metal brackets on both sides of the amp's chassis, exposing the input PCB and the mains transformer sides of the amp. Is there a method to get to the bottom of the amp to complete my brushing/blowing? (There are a lot of screws on the underside)

- Is it safe to clean the topside of the amp's PCBs with denatured alcohol or equivalent cleaner? How about the face plate?

- The speaker connectors are funny in this amp and didn't come with my purchase. I have a few spare of the Rogers/Armstrong 2-pin connectors from amps like the Armstrong 500 series. I haven't gotten them out to see if they would be direct replacements since I haven't figured out how to access the underside yet.

- Would it be advantageous to spray the push buttons with switch cleaner or deoxit? I haven't seen these types before so I don't wish to damage them.

- Any other general advice or known issues I should address before firing the amp up? I imagine it may need a recapping and bias adjust once I can get it running.

I appreciate any help you guys could provide. This place is a wealth of knowledge for someone like me far away and I always enjoy conversing about this equipment. Regards,

Chris
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Old 22nd Sep 2019, 10:00 pm   #2
ajgriff
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Default Re: Rogers Ravensbourne amp restore

The manual can be downloaded from Hi-Fi Engine once you've completed the simple free registration process. You will find some guidance regarding the chassis only version plus other useful information.

- Denatured alcohol should be fine for internal cleaning but be careful with the legends on the front panel.

- The speaker outputs are standard (then) two pin DIN sockets like the Armstrong.

- Cleaning the switches as you describe would be well worthwhile.

- Check for obvious signs of component deterioration before gently bringing to life with the Variac (monitor current of course).

Hope this helps. I have a Ravensbourne on the to do pile so haven't yet gained direct experience!

Alan
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Old 22nd Sep 2019, 10:29 pm   #3
Trevor
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Default Re: Rogers Ravensbourne amp restore

Congratulations you have obtained a design classic very underated I first met with these nearly 50 years ago a design classic very valve like in its sound
Most unusual in design
I still have a no of these
Trev
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Old 22nd Sep 2019, 11:51 pm   #4
RojDW48
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Default Re: Rogers Ravensbourne amp restore

I had one of these for a long time. A very good amp. I recall the push button equalisation for TT input, while very clever, was susceptible to 'splatting' (dirt, shaky contacts etc) - give it a good clean and squirt of Servisol.
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Old 23rd Sep 2019, 9:35 pm   #5
Trevor
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Default Re: Rogers Ravensbourne amp restore

If you use the search function and type in Ravensboune you will find a few good threads on your amplifier
Trev
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