jimbo-G
154 posts
Mar 17, 2013
12:43 PM
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Just got my first tube amp its a Leo 5 watt I think It was made by triumph electronics.2x ecc83 (one for the tremolo one for pre amp) 1x el84. Original 8" speaker. This thing is great I'm totally loving it. Iv got plans to build a new cabinet for it and maybe putting another 8" in there. It's made from really thin plywood.
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FMWoodeye
599 posts
Mar 17, 2013
12:51 PM
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Nothing like some new gear to brighten your day. Have fun.
Last Edited by FMWoodeye on Mar 17, 2013 2:54 PM
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Bruce S
30 posts
Mar 17, 2013
1:12 PM
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Congrats... They're a great little harp amp. A friend of mine has one but rehoused in a thicker ply cab. I've done some work on it and love the sound. I just seem to keep on missing them on ebay!
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5F6H
1582 posts
Mar 17, 2013
1:31 PM
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I personally wouldn't change the cab if it is still roadworthy. These are great sounding little amps.
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jimbo-G
155 posts
Mar 17, 2013
1:34 PM
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I got mine for £50 off eBay dunno if that's a good deal, but I don't care I love the sound.
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Littoral
807 posts
Mar 17, 2013
2:15 PM
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KEEP THE CABINET ! IT IS PART OF WHY IT SOUNDS GOOD!
*caps did mean I was yelling, with enthusiasm.
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jimbo-G
156 posts
Mar 17, 2013
3:00 PM
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I might have just been convicted to keep the cab, cheers littoral
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HawkeyeKane
1550 posts
Mar 17, 2013
4:23 PM
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Jimbo, you could always build yourself a 2x8 cabinet to use in an external capacity with the Leo. Never hurts to have another speaker cab on hand.
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Hawkeye Kane
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jimbo-G
157 posts
Mar 18, 2013
2:45 AM
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that's s a good idea, the amp doesn't have a line out but. is it an easy mod to fit a line out. the amp uses a 8ohm speaker.
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5F6H
1583 posts
Mar 18, 2013
3:25 AM
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@Jimbo-G - You sure it's an 8ohm speaker? It won't hurt if it is, you may even prefer the sound of an 8ohm, but they are usually 4ohm (marked as "3.2ohms")?
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jimbo-G
158 posts
Mar 18, 2013
3:41 AM
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I got the volt Meter and measures the resistance on it and it was floating around the 8ohm mark. I thought it was quite important to get the right sized speaker for a valve amp or it could put the impedance matching transformer under stress?
Edited: its not the big 12" elliptical one its the newer model with 8" round.
Last Edited by jimbo-G on Mar 18, 2013 3:49 AM
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5F6H
1584 posts
Mar 18, 2013
3:57 AM
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Good lad, you're one step ahead of me there ;-)
A speaker's DCR always reads a little less than the rated impedance, never more.
Yeah, I've seen the 8" speakers in 4ohms too (own one of each). The OT seems a fairly low primary impedance for an EL84, so 8ohms speaker will even work well on an amp rated at 4ohms (if that was what you had, obviously it isn't).
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Last Edited by 5F6H on Mar 18, 2013 5:35 AM
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jimbo-G
159 posts
Mar 18, 2013
4:29 AM
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So that means I have the option to put a 8 or a 4 in there? Thats interesting I have a 4ohm 8" from an old valve radio. Also those old radios and record players are a great way to get valves cheaply
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5F6H
1585 posts
Mar 18, 2013
5:34 AM
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Hi Jimbo, No, that's not what I said. The 4ohm amps will handle a 8ohm speaker. If yours came with an 8ohm & has a transformer wound for 8ohms, then use an 8ohm speaker. If the OT's primary impedance is on the low side for 8ohms, then fitting a 4ohm speaker will burn it up & kill your EL84.
Editing the earlier post for better clarification.
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jimbo-G
160 posts
Mar 18, 2013
5:54 AM
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Cheers for the clarification 5f6h, I could have made a horrible mistake.
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HawkeyeKane
1551 posts
Mar 18, 2013
8:23 AM
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@jimbo
To clarify MY post about the external cabinet....
What you'll need to make that happen is NOT a line out. Don't get me wrong, adding a line out isn't a bad idea at all. In fact for a 5W amp being used for harp, it can prove essential if you intend to play it in a band or jam session. But that kind of output signal is for running the amps output to a PA or another amp.
For the external speaker cab, what you'll need to equip it with is an external speaker jack, or fix a cutoff plug assembly to the internal speaker and leads.
You can either route the leads to a 1/4" cutoff jack that you install somewhere in the back or side of the cabinet, and the internal speaker will shut off when you have the external cabinet plugged into the jack and running.
Or you can fix a forked 1/4" speaker cable to the speaker terminals, and fix the amp's output leads to a 1/4" female connector. Have the two ends plugged togetehr to run the internal speaker, or unplug them and run a speaker cable from the female connector to your external cabinet.
In either case, DON'T unplug the speaker while the amp is on. As Mark has pointed out, you can quickly fry your output transformer that way.
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Hawkeye Kane
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jimbo-G
161 posts
Mar 18, 2013
1:07 PM
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Cheers for all the help guys, I appreciate it.
@hawkeyekane, I did think about how to make the internal speaker cut off because of the ohm not matching, but never knew about how to do it. Cheers man.
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