| Author | Message | ||
| dennis v |
Hi. I have a mm 130hd 212 and the "hi/lo" switch doesn't make any difference when I switch it. Could it be that the switch is broken or something else? | ||
| Mike H |
In terms of volume, or dB, you really shouldn't hear much difference. The Hi/Low switch affects the volts to the plates of the tubes. In the Hi position, you should have 700+ volts, and in the low, something like 500 volts. This really affects the headroom of the amp. In Hi, you get a cleaner tone up to maybe 5, whereas in low, the clean tone maybe to 4. 130 watts compared to 65 watts is not significant in terms of dB. Doubling the ouput power only results in about a 10% increase in dB, which isn't real noticable in terms of dB. A lot of guys run their MM in the low position, for earlier break up, and because in the hi position, 700+ volts is a lot of power on the plates of modern tubes. Your tubes will last longer in the low position. | ||
| Anonymous |
Broken switch; Old caps; etc... Definative verification via plate voltage. (Dangerous if amateur...) | ||
| William Michel (bill) Username: bill Registered: 12-2006 |
I have two 150 combo sound weapons, with the non-tubed pre-amp. Neither one was affected in the least when tripping the switch, whereas on earlier models, a huge difference is discernable, and the light dims when switched to low. I think it's a dummy to lead you into thinking there's more variety. (objects shatter and the crack in the foundation of the basement grows larger in either position) Just my opinion. |
Tue, 03/25/2014 - 09:27
#1