Members brake Posted November 15, 2005 Members Share Posted November 15, 2005 do-able? Link to comment Share on other sites More sharing options...
Members boseengineer Posted November 15, 2005 Members Share Posted November 15, 2005 Not good for a solid state head, tube head would be okay, For solid state (which are most heads these days) can should have equal or bigger impedance than the head. 4 Ohm head into an 8 Ohm cab is fine, but not the other way around.8 Ohm solid state heads are pretty unusual. 4 Ohm and even 2 Ohm is more common. Make sure you have the spec right. Link to comment Share on other sites More sharing options...
Members brake Posted November 15, 2005 Author Members Share Posted November 15, 2005 It's tube. I've done the opposite with SS before (4 ohm head, 8 ohm cab) and it's worked fine, thanks. Link to comment Share on other sites More sharing options...
Members illidian Posted November 15, 2005 Members Share Posted November 15, 2005 It's a 2.66666666 (ad nauseum) load. There is typically no ohm tap for 2-2/3 ohms on tube amps. Ask your manufacturer which is better - the four or the two - for the life of the tubes. Link to comment Share on other sites More sharing options...
Members oldivor Posted November 15, 2005 Members Share Posted November 15, 2005 Originally posted by illidian It's a 2.66666666 (ad nauseum) load. There is typically no ohm tap for 2-2/3 ohms on tube amps. Ask your manufacturer which is better - the four or the two - for the life of the tubes. Link to comment Share on other sites More sharing options...
Members illidian Posted November 15, 2005 Members Share Posted November 15, 2005 Originally posted by mxpxfan Haha! Now I read the title. *sneaks out the back corner* Link to comment Share on other sites More sharing options...
Members Emprov Posted November 15, 2005 Members Share Posted November 15, 2005 Originally posted by brake do-able? Sure, it's do-able...not for very long, but it's certainly do-able! Link to comment Share on other sites More sharing options...
Members brake Posted November 15, 2005 Author Members Share Posted November 15, 2005 Is there a way to find out what my amp is, for sure? all of the literature i've found on it says it's 8, but for some reason a while back, i KNEW it was 4 (dunno how, but i did) and the repair guy i just got it back from tells me it's 4. i've run it with 8 ohm cabs with no problem, so i'm assuming that's what it is. i assumed i wouldnt be able to run an 8 into a 4, but the reason i ask, is my guitar player has basically the same amp (yba-1a, mine is a yga-1a..same circuit sans tremolo) and a 5.3ohm cab (the matching cab the head was sold with) and it works fine, i was wondering how that worked when a 4 ohm cab wouldnt? does that make any sense? i'm {censored}in' tired. Link to comment Share on other sites More sharing options...
Members boseengineer Posted November 15, 2005 Members Share Posted November 15, 2005 For a tube head it's okay to run a lower impedance cab. Shouldn't be a problem. "Tube" here refers to the power amp section not to just a single pre-amp tube somewhere in the low voltage. Tube power amp usually means big and heavy (because of the extra output transformer). If you provide make, model, and year of your head, I may be able to dig up a data sheet. Link to comment Share on other sites More sharing options...
Members SA Rios Posted November 15, 2005 Members Share Posted November 15, 2005 What the hell are you guys talking about. 8 ohm head??? Since when are heads measured in ohms. Link to comment Share on other sites More sharing options...
Members Rippin' Robin Posted November 15, 2005 Members Share Posted November 15, 2005 (loosely quoting L. Ron Hoover, the amp Guru) A tube amp can match a 200% impedance mismatch. But are you sure there's no 4 ohm tap? Link to comment Share on other sites More sharing options...
Members ghastlyone Posted November 15, 2005 Members Share Posted November 15, 2005 Originally posted by brake Is there a way to find out what my amp is, for sure? all of the literature i've found on it says it's 8, but for some reason a while back, i KNEW it was 4 (dunno how, but i did) and the repair guy i just got it back from tells me it's 4.i've run it with 8 ohm cabs with no problem, so i'm assuming that's what it is.i assumed i wouldnt be able to run an 8 into a 4, but the reason i ask, is my guitar player has basically the same amp (yba-1a, mine is a yga-1a..same circuit sans tremolo) and a 5.3ohm cab (the matching cab the head was sold with) and it works fine, i was wondering how that worked when a 4 ohm cab wouldnt?does that make any sense? i'm {censored}in' tired. I have the yba-1a as well and I use a 4 ohm traynor 4x10 (from the later '70s solid state days) . My tech actually told me about the cab being for sale so I asked the same question about the 8ohm->4 cab and he said its not an issue when dealing with a tube amp. I have an Ampeg B-25B hooked up to that same cab at the moment and it's the same deal. Link to comment Share on other sites More sharing options...
Members boseengineer Posted November 15, 2005 Members Share Posted November 15, 2005 Originally posted by SA Rios What the hell are you guys talking about. 8 ohm head??? Since when are heads measured in ohms. All solid state amps have a minimum impedance at which the deliver maximum power and below which they will shut down (or blow up). It's listed for any amp out there and usually printed right next to the speaker outputs of the amp. Take a peek at yours. Link to comment Share on other sites More sharing options...
Members nephilymbass Posted November 15, 2005 Members Share Posted November 15, 2005 my personal opinion is always drive your amp. But also keep in mind that its more dangerous to underpower your cab than to over power it. I've had several cab configurations over the years. my advice is if you can handle moving it. Get an 4ohm 610 or 810. Some of the new 412 cabs made by ampeg and aguilar are nice as well. You've got alot more chance of causing speaker damage in a 8 ohm cab than a 4 ohm. I've never had any problems with the 4ohm 610 and 810s (SWR, Peavey, and now Ampeg) I've owed. The biggest factor in my opinion is your amp, watt rating is 99% of the time BS. (IE. my guitar player has had a 200W line 6 head, a 120 watt tube head, and his mesa 50W head is louder than anything he's owned. ) If you want to be able to do more things. The cab I have now is actually the ampeg 810E. Its devided. and able to run as one 4ohm load(which is what I do with an SWR 750), or you can actually run it with two different sounds(which I have several friends that are doing this with 2 seperate cabs using ampeg and sansamp pres teamed with a mackie 1400 any who as always when it comes to gear, don't half step it, it'll be alot cheaper in the long run if you get save your money and get what you really want. go to your local music store and try things out. If they give you a hard time about it, go to a different store. Link to comment Share on other sites More sharing options...
Members SA Rios Posted November 15, 2005 Members Share Posted November 15, 2005 Originally posted by boseengineer All solid state amps have a minimum impedance at which the deliver maximum power and below which they will shut down (or blow up). It's listed for any amp out there and usually printed right next to the speaker outputs of the amp. Take a peek at yours. Yea, I know, but he said 8 ohm head. Heads are measured in watts. The term 8 ohm head means nothing. The wattage you get out of the head depends on the impedence of the cab. SS heads can go either 8 or 4 usually, most can't go under 4 but there are some that can see a 2 ohm load. I get 300 watts at 8 and 600 at 4 ohms. The back of my amp says not to go below 4 ohms. I would'nt call my head a 4 ohm head, though. Its a 600 watt head @ 4 ohms Link to comment Share on other sites More sharing options...
Members WildPotato Posted November 15, 2005 Members Share Posted November 15, 2005 If the amp was packaged and sold with a 5.3 ohm cab, I doubt a 4 ohm cab would cause much trouble. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted November 15, 2005 CMS Author Share Posted November 15, 2005 Originally posted by SA Rios Yea, I know, but he said 8 ohm head. Heads are measured in watts. The term 8 ohm head means nothing. The wattage you get out of the head depends on the impedence of the cab. SS heads can go either 8 or 4 usually, most can't go under 4 but there are some that can see a 2 ohm load. I get 300 watts at 8 and 600 at 4 ohms. The back of my amp says not to go below 4 ohms. I would'nt call my head a 4 ohm head, though. Its a 600 watt head @ 4 ohms He just meant that the head is rated for an 8-ohm load. I knew what you meant, and I knew what he meant. No biggie, I think. Brake......what amp is it? This whole thread you never mentioned it, and that's the most important detail...if we know the amp we can let you know if it's do-able with a whole lot more certainty. Link to comment Share on other sites More sharing options...
Members ghastlyone Posted November 15, 2005 Members Share Posted November 15, 2005 He said it is a Traynor YGA-1A which actually is a combo and the YGA-1 is the head. It's the same amp as the YBA-1 Bass Master (but not YBA-1A) with the addition of tremolo. They are rated at 45W @ 8 ohms. The YBA-1A mentioned is rated 90W @ 8 ohms and came with a 6x10 5.33 ohm cab. Link to comment Share on other sites More sharing options...
CMS Author Craig Vecchione Posted November 15, 2005 CMS Author Share Posted November 15, 2005 Originally posted by ghastlyone He said it is a Traynor YGA-1A which actually is a combo and the YGA-1 is the head. It's the same amp as the YBA-1 Bass Master (but not YBA-1A) with the addition of tremolo. They are rated at 45W @ 8 ohms. The YBA-1A mentioned is rated 90W @ 8 ohms and came with a 6x10 5.33 ohm cab. So he did. Totally missed that despite reading it twice. A 4ohm load should pose no problem at all. Link to comment Share on other sites More sharing options...
Members brake Posted November 15, 2005 Author Members Share Posted November 15, 2005 Originally posted by ghastlyone He said it is a Traynor YGA-1A which actually is a combo and the YGA-1 is the head. It's the same amp as the YBA-1 Bass Master (but not YBA-1A) with the addition of tremolo. They are rated at 45W @ 8 ohms. The YBA-1A mentioned is rated 90W @ 8 ohms and came with a 6x10 5.33 ohm cab. Nope, my YGA-1A is a head. I've found nothing online about the heads, but, yeah. EDIT: and, oddly enough, my head matches up with the serial number scheme with all of the yga-1a combos. Link to comment Share on other sites More sharing options...
Members ghastlyone Posted November 16, 2005 Members Share Posted November 16, 2005 Interesting. Since IIRC they both use the same chasis and layout it's probably not unheard of to see a head labeled -1A. So are the two lo/hi "range expander" (actually mid and presence) knobs like on your friends YBA-1A replaced by tremolo controls on yours? Link to comment Share on other sites More sharing options...
Members mrcrow Posted November 16, 2005 Members Share Posted November 16, 2005 Originally posted by boseengineer All solid state amps have a minimum impedance at which the deliver maximum power and below which they will shut down (or blow up). It's listed for any amp out there and usually printed right next to the speaker outputs of the amp. Take a peek at yours. and the manufacturers booklet will usually say what speaker ohmages to use... mine says 8.. Link to comment Share on other sites More sharing options...
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