MontanaWay wrote:all I can say is D'OH!!!!!!!
Individual output tube bias pots are an option on Holger's (Montana Way)'s Big Bopper amplifier iterations of the M-125 mono-blocks. I highly recommend this option as you can monitor each tube that way, and if one tube gets out of sorts you don't have to guess which of the pair it is.
I had just gotten into the habit of shooting for 1.2VDC per pair in my original M-125s as opposed to 0.6V PER TUBE and when I last did an output swap I cranked one of the four pots up to 1.2V, which is twice the bias a single is designed to handle.
I owe Holger an apology for unintentionally implying this was a design flaw. Far from it. I ordered the individual bias option and am glad I have it. Montana Way's amps are well designed, sturdily built and flat-out gorgeous to the ears and eyeballs. We've been doing business for well over a year now and I'm also proud owner of his "Janis" phono preamp -- essentially a well souped-up PH-16. This lash-up, anchored by Don Sachs' SP-14-based line preamp, is as good as it gets.
There are several other good builders/modifiers of these splendid kits that Drs. Mottram and Latino have brought to our table. Troy Madden and Bill Gratix come to mind and there are no doubt others. Can't go wrong with any of 'em.
OR, you could sell the Cadillac, the Range Rover, your first-born and forget that swimming pool and get something almost that good.
BTW Burial Services for that post-war Tung-Sol 6550 commence at 1500 hours today. It will be interred in its original cardboard box in a shallow hole in the back-yard, along with $150 in Federal Reserve notes to remind future generations of its value and its ability to perform at twice its bias. It lived a good, long, and dutiful life. Flowers are not necessary. Regrets in its memory may be sent to the Macallan Scotch Co.
Last edited by deepee99 on Sat Dec 19, 2015 12:31 pm; edited 1 time in total (Reason for editing : Funeral scheduled)