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Old 23rd January 2009, 09:38 PM   #1
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Default Rogers Tube Amp

I just pulled an amp from a Rogers floor model Stereo. It's kind of cool but I know very little about tubes. I was wondering what kind of power it has. Sounds like it is running out of steam into 8 ohm load. Not enough resistance or tubes tired? What I think are out puts are 6Gw8 ECL88. Appears to have a pair in output stage. Thanks
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Old 24th January 2009, 03:08 AM   #2
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Most old tube amps need a recap job. Electrolytics and PIO first for sure.

Tubes might still be OK.

Cheers!
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Old 24th January 2009, 02:20 PM   #3
kevinkr is offline kevinkr  United States
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Probably about 8W per channel if PP (2 per channel) and somewhat less than half that if SE. (Just 2 output tubes total)

You should plan on replacing the supply filter caps immediately and at least the coupling caps to the output tube grids.

For safety I would recommend installing a 3 wire power cord and securely grounding the chassis. Hopefully there is a fuse on the primary - if there isn't you will need to add one.

I would also recommend reading the safety thread for tips on working on this amplifier safely since you admit to being inexperienced with tubes.

These kind of power levels require efficient speakers. (IMO probably > 96dBspl or so)
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Old 24th January 2009, 08:11 PM   #4
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Quote:
These kind of power levels require efficient speakers.
AGREED!! Paul Joppa has provided the community with a useful rule of thumb. Joppa's Rule states, in an "average" listening space, an amp/speaker combo should be capable reaching at least 102 dB. SPL peaks, measured at a 1 M. distance. With 8 WPC available, speakers whose SPL rating is an honest 93 dB. form the lower limit.
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Old 26th January 2009, 10:04 PM   #5
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Default TUBE AMP

This is the amp. Last time I turned it on I saw a spark at the tube nearest the transformer. Is this a boat anchor or worth fixing up and/or modding? File is too big I'll resend
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Old 26th January 2009, 10:25 PM   #6
jkeny is offline jkeny  Ireland
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If it's a Rogers Cadet tube amp then have a search here. I've modded/updated a Cadet amp to great effect. The original sounded good - it was my first tube amp recovered from a recycling centre a couple of years ago.
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Old 26th January 2009, 10:35 PM   #7
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Default Tube

What's the esiest way to cut jpeg size?
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Old 26th January 2009, 11:04 PM   #8
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What's the esiest way to cut jpeg size?
This is how I do it :

open the picture in an editing program, ie Microsoft Photo Editor, or whatever you may have.
Then either crop it, ie cut off unwanted parts,
or if you need all the picture, reduce the resolution or detail.In Photo editor when you do a save as jpeg there is a button you can click for more options. Do that and slide the picture quality bar to the left to reduce the quality and the file size. I think there is about 10 to 1 reduction in file size from max quality to min quality.

Other picture editors will have different ways of doing this.
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Old 27th January 2009, 12:26 AM   #9
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Default Re: Tube

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Originally posted by argonrepublic
What's the esiest way to cut jpeg size?

Get IrfanView. It's terrific freeware that allows for all sorts of graphic format viewing and conversion.
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Old 27th January 2009, 12:39 AM   #10
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Default Tube amp small

Thanks everyone. I am looking forward to becoming more involved here again. Following a brutal divorce, my brain turned to mush. This stuff all seems so complex now. Anyways here's tube amp/receiver.
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