https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/ Guitar Noise Discussion Board en-US Thu, 04 Jun 2026 07:51:29 +0000 wpForo 60 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245535 Fri, 01 Jun 2007 22:19:03 +0000 Live Sound Ricochet https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245535 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245474 Fri, 01 Jun 2007 10:42:48 +0000 Maybe yours is old school.]]> Live Sound greybeard https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245474 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245444 Fri, 01 Jun 2007 04:26:36 +0000 Live Sound Ricochet https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245444 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245428 Fri, 01 Jun 2007 02:32:44 +0000
And I'm knew to tube amps so it might look like a stupid question but it is possible to "boost" it so I can't take advantage of the 12" speaker? Is changing the tubes will significantly improve the volume level? As for now, it sounds good with no level variation or unwanted distortion, but it way too quiet for the size of it (16.5 inches wide by 8 deep by 20 high). Is this normal?

Thanks again. I will try to check old threads as well.]]> Live Sound FrankyD222mtl https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245428 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245389 Thu, 31 May 2007 22:30:21 +0000
You can and should replace the old cord with a polarized one, making sure that the proper color coding is observed so that the white neutral wire is the one that connects to the chassis, and the black, hot wire is the one that goes to the switch. Then it'll be up to the approved safety standards of 40 years ago. Won't pass today's safety standards, and you can't make it pass. Plugging it into an isolation transformer is the only way to completely remove shock hazard, though it's a relatively low risk with a properly polarized cord. Isolation transformers are available from electronics supply houses such as: http://www.mouser.com/
http://www.tubesandmore.com/
http://www.alliedelec.com/]]> Live Sound Ricochet https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245389 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245366 Thu, 31 May 2007 21:31:09 +0000
Just wait for Richochet to show up on this thread, I am sure he will eventually :-) Meanwhile, until you know what is going on, leave it unplugged. Hig voltages can be dangerous to your health :twisted:]]> Live Sound vink https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245366 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245307 Thu, 31 May 2007 16:45:48 +0000
Anyway to boost this or I am stuck with that unpowerful sound?]]> Live Sound FrankyD222mtl https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245307 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245281 Thu, 31 May 2007 15:26:56 +0000
Old style plugs (like those from the 60s) can go into the wall either way, and modern ones have one 'leg' wider, so they only go one way. Some old tube amps have a polarity switch in the back, so you can toggle it.

The reason I doubt it's polarity is that your pedal probably isn't running AC current, right? So there's just a small battery, and it's also running on the same 'path' as your guitar - guitar into pedal, pedal into amp. Polarity issues raise their ugly head when you have two AC circuits - typically the amp and a microphone that's going into a PA - and you close the gap between the two circuits. My guess is it's a grounding problem.

The plate on the back is power IN, not power OUT - it's the spec for your 'wall current' to keep you from plugging it into the wrong source. I think that amp puts out somewhere between 5 and 7 watts.]]> Live Sound NoteBoat https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245281 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245266 Thu, 31 May 2007 10:18:27 +0000
The polarity problem is that the plug could be plugged in either way, creating a 120 volt difference on the ground line compared to other devices. I'm not too sure on how to fix it, and your amp be of a slightly unusual design, most of the schematics of amps I found using those tubes do not have a power transformer. If you could post some pics someone else may be able to help. In the mean time be careful.]]> Live Sound egdinger https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-245266 https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-25922 Thu, 31 May 2007 09:01:30 +0000
Another problem I have is it seems to lack power. There's a mention "135 volts, 60 cycle, 0-25 amps" and it looks like something in between 15 to 25 watts to me since has a 12" speaker. The sound seem good but it's defintly not loud enough. It sounds not louder than a 5 watts solid state.

This is my first tube amp. Any advice on what do do? Anyone knows anything about Granada?]]> Live Sound FrankyD222mtl https://guitarnoise.forum/live-sound/just-bought-a-60s-tube-amp-advice-needed/#post-25922