By the way, does anybody know what it should be worth on the used market? I guess it's cheaper in the US. I got mine used for 1 235 dollars in Sweden from the guitar store, but if I'd ever want to sell, maybe that price would be different?

In the beginning was reverb

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edwardsand wrote:

Your amp is designed for a 4 ohm speaker load, which is what you have with four 16 ohm speakers wired in parallel. If you disconnected two speakers and had the remaining wired parallel, the speaker load would be 8 ohms.

With tube amps, it's best to match the output impedance of the amp with that of the total for the speakers - if not, you can damage your amp, especially if you play a lot or play loudly. Mismatching the amp to a speaker with higher impedance may be okay for a bit, but could end up damaging the output transformer.

With solid state amps, it's generally okay to run an amp through a higher impedance speaker, but not a lower one.

I looked up how to calculate the total impedance of 2 or more speaker wired in parallel. So because alle the speakers are 16 ohms I can just divide 16 with the number of speakers and get 4 ohms, right? But how do I know the amp's output ohms? Can't read it on the amp except that 4 ohms is the minumum load for speakers. Do you mean that the amp's output is 4 ohms when you say it's designed for 4 ohms load? I just read that it's ok if you don't go above double the amp's output ohms and 8 would be exactly double if the amp is 4 ohms. But yes that would not be good to play loud on. I thought that I could get more sag and even less mids if I instead used a lower ohm speaker than the amp's output, but i also says I can't go lower than 4 ohm on the back of the amp. But of course two speakers would be higher impedance so I'd get even more mids I guess. Maybe it's just fine as it is. Maybe I could buy two 8 ohms speakers and just use those instead.
Maybe I should just play guitar...

In the beginning was reverb

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Last edited: Jul 13, 2018 11:07:03

edwardsand wrote:

The markings on the back of the amp tell you what it's designed for (4 ohm). I have read comments from people who've hooked up their tube amps to higher impedance configurations (up to twice the amp's rating) and have had no problem, but other people warn about the dangers. If I had an old amp like yours, I wouldn't risk it, but you might find it works for you. Certainly you could hook it to an external cabinet that's 4 ohms, for example, 2x12 with two 8ohm speakers wired in parallel, or a single 4 ohm speaker.

I just found that Weber offers a silencer that you can hook up to your speakers, allowing you to cut off a speaker (or multiple speakers - each speaker requires a separate silencer). Those are $45(US) each, and with two of them you could do exactly what you want without risking any damage to your amp and you wouldn't have to get other speakers or an extension cabinet. I assume it would even allow you to play around with picking which speaker to silence.

Of course, there may be other places you could get the same sort of silencer, but I don't know of any. I'm not affiliated with Weber, but I did get a speaker from them that I really like.

Ok, I actually just found it on the schematics. It said that it's a 4 ohm speaker hookup, so it's gotta be 4 ohm, as you said. Could not read it on the amp, I think.

Question nr 1: someone told me that if you hook it to an external cabinet it will be hooked in series through the external speaker jack. But, if the ext. speaker is 4 ohm, wouldn't that give me 4 ohm + 4 ohm = 8 ohm? Or is it actually hooked in parallel so it actually gives me 4/2 = 2 ohm which is to low for the amp? I'm starting to get confused.

Question nr 2: so the silencer just makes the speaker mute while still running? Awesome idea. Gotta look it up!

In the beginning was reverb

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Last edited: Jul 13, 2018 16:45:02

On most Fenders, the external speaker is added in parallel with the combo speakers.

I don't think those jacks get used very often, but most traditional Fender amps can tolerate a fair bit of impedance mismatch. Not sure about that for a 70W 2x6L6 amp. I think the impedance is more critical for Marshalls' output transformers.

Tone isn't much different if you mismatch impedances.

Last edited: Jul 13, 2018 21:32:53

edwardsand wrote:

Usually when you hook up an external speaker cabinet to your amp, it cuts off the internal speakers, so you don't have to worry about computing the total impedance - just go by what the impedance of the external cab is.

I believe that's exactly what the silencer is supposed to do - it mutes a speaker but basically keeps the same impedance in the chain of speakers. The Weber silencer looks like it's made for speakers up to 20W - yours might be higher rated, so you might need to look for a similar device with a higher power rating - I would e-mail Weber and see what they say.

I read on a forum that somme guy didn't get a convincing difference with the silencer on two speakers. http://www.tdpri.com/threads/anyone-use-a-weber-speaker-silencer-switch.15797/

Though from what he wrote maybe he used only one silencer wired in some way to both speaker and maybe that's why it was too weak. Or maybe wrong wattage?

In the beginning was reverb

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Tailrocker wrote:

Hard to say how long you could get away with it. I run my 35W Fenderish homebrew wired for 4 into 8 ohms sometimes but it has a really sturdy transformer. And if it blows I'll replace it with another one from Allen Amps and get a perverse joy out of doing so.

Have you tried that thing with your band yet? It should sound ginormous all by itself; it's an open-backed cab that moves a lot of air.

Yeah, we should have played today, but I've been sick so we canceled. But soon it will be done. Maybe I'll even post some audios.

I think I'm gonna go and pull out the V1 now and see.

In the beginning was reverb

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Not a good idea for the speakers. Bass speakers are made for low frequencies; guitar speakers can blow with bass. This is supposedly due to frequency-dependent impedance; the impedance is lower at low frequencies meaning more current through the voice coil.

Reatavlos_88 wrote:

nor how to tell that it is from '79.

That's a good amp, and with tweaking and patience, you'll get a monstrous tone out of it.

According to this website: http://www.superiormusic.com/page195.htm
your amp is from 1981

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Dave Wronski used modified Super Reverbs at one time with Slacktone. David Arnson has been using a silverface (no master volume) forever. I bought a mid 70s one (with master volume) and used it for awhile. I was going to sell it, but after I got it tweaked, I kept it as it's a beautiful beast when cranked.

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I had a 1967 Super Reverb a long time ago. It was a great amp. Try the built-in reverb before buying anything else. It may be all you need.

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