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Title: A ridiculous request/challenge Post by: tboulette on December 16, 2011, 06:20:14 PM I'm waiting to receive my new OTS FM100, built largely by Nik but with a few components by tenguitars (Henry Cendejas -- who, if you haven't dealt with him, has been absolutely wonderful; I have a 2x12 coming from him shortly as well). Should arrive Saturday, subject to the vagaries of FedEx Ground this time of year....
I've been fascinated by electronics for awhile now (having built perhaps 7 or 8 various pedals plus a couple of A/B switches), but I'm coming to it too late in years to have the opportunity to really study it. To amuse myself while I wait, I've been comparing the layouts of the regular OTS 100 and the OTS FM 100 to try to spot the differences, of which there were (to me) surprisingly few. I realized after completing the task, however, that I really had no idea what the various changes did to the tone, or even what components constituted the tone stack vs. some other part of the amp -- much less which are the "plate resistors" and "slope resistors" are, and - and - and ... ! I've just ordered a copy of Gerald Weber's Understanding Vacuum Tube Guitar Amplifiers DVD, which I hope will satisfy my curiosity about this stuff in general. However, I'm wondering if anybody would be interested, by way of educating the rest of us, in explaining how the differences between these two amps affects the tone. If not (and I wouldn't blame you), any suggestions for a good website or article on this general subject? Thanks for reading, and even more for guidance. Tim Title: Re: A ridiculous request/challenge Post by: boldaslove6789 on December 16, 2011, 06:44:43 PM There are very little differences between the both of them.
One being a switchable LNFB (local Negative Feedback) loop on the V1 preamp tube. This gives you another EQ option, gives the amp a different response and attack. With no LNFB loop on v1 the amp is more open. Dumble #183 does not have a LNFB loop on V1 too. Another is there is no 68pF bright cap on the Master Volume. The original Dumble ODS #102 had a big bright cap on the Master Vol, Dumble made Robben ford RG-400 cables to roll some of the highs off. Not having the bright cap just makes the amp less bright, no need for RG-400 cables with it off. In addition to that there is a 3 way Bright switch on it. Dumble #183 has a 3 way bright switch also. All it does it make the amp brighter. One setting is really bright, the other is not so bright, as well as a center Off position, |