Recent content by gilbjd

You may be thinking of the Ashdown Drophead LB-30 15H. The amplifier was essentially the same as the 30W Little Bastard (4 x EL84 output tubes). It had a 15 inch speaker and sounded not dissimilar to the B-15. It is long discontinued. Ashdown also made a 200W version (4 x 6550 tubes) that is...

Thanks again Beans. I'm not inclined to do any more work on either of the B-15's at the moment as they are both buttoned up and functioning very much to my liking. Next time I go delving into either, however, I'll be sure to try this out. I've saved a copy of your message for reference...

Dear Beans... Bravo and wow! This works! I've just completed this mod on my 2012 Heritage B-15 and, for the first time in 13 years, the amp is practically silent except for the barest detectable hum if you put your ear to the speaker. Silent for practical purposes just like my 1965 B-15...

Many thanks for this Beans. With reference to the 2012 HB-15 schematic drawn by Pyotr Belov on 12/12/2012, if I understand you correctly, does this mod involve decoupling the ground end of C20 (and presumably its R41 bleeder resistor) from the ground buss from CH_GND1 and connecting it to the...

All four input jacks on my amp have working grounding switches. The amp gets little use. It's still essentially in mint condition. One thing that I found did help with the hum was dropping the AC input voltage a little with a variac. With a typical AC mains voltage of 240VAC where I live, the...

The hum from my 2012 HB-15 is nowhere near as bad as shown in the video you posted above. In particular it is a constant low level 100 Hz hum (50 Hz power here; this would be 120 Hz on a 60 Hz supply) that is present even when the volume controls are set to zero. It is not terrible but annoys me...

I would be really grateful if we could determine the fix for the 2012 HB15 hum. I've still got this problem.

Thanks very much Ken. The Mustang pickup is not as straightforward as I thought! However, I'm pleased that my mod has completely eliminated hum from the Mustang pickup. On the American Performer, I do notice that the hum of the J pickup is only reduced when the Mustang pickup pot is at full...

Sorry to resurrect an old thread but I think I have a solution to this problem. I have an American Player Mustang (2018 serial no.) and a Vintera 60's Mustang (2019 serial no.) - both with the small, two piece Mustang pickups in the P position. Both had annoying single coil hum and buzz. The two...

The Seymour Duncan Custom Shop offers custom Mustang pickups with a choice of black or white covers. Maybe they could sell you a set of white covers. Mustang Bass

Thanks David. The hum occurs with nothing connected to the inputs and with both volume controls at zero. I've powered it through a variac at 200-220V and it made no difference. The hum is identical with either bias setting. Repositioning the amp makes no difference at all so I don't...

I took delivery of a 2012 Heritage B-15 (Serial 72 of 100) yesterday. As I'm in Australia, it is a 220-240V model. Like Apex_speed, I am getting low level hum from the speaker with nothing on the input and the volume controls at zero. I find it annoying. I emailed Ampeg technical support last...