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Title: Tube rectifier in OTS - possible?? Post by: AdrianJ on April 26, 2012, 09:37:45 PM So I've been looking at other D-Type derived amps and noticed that some of them have tube rectifiers.
My questions are: 1) Is this worth it on an OTS amp where, as I understand it, the magic is in the pre-amp? 2) Is it even possible on one of Nik's designs? (Specifically I'm leaning towards the HRM BM with a switchable HRM bypass) As always, thanks guys AJ Title: Re: Tube rectifier in OTS - possible?? Post by: plasticvonaband on April 27, 2012, 07:09:48 AM The OTS transformer doesn't have the necessary 5v tap for a tube rectifier. You can add on a 5v transformer and wire it up that way, or alternatively torres engineering makes a few add on kits with transformers and switches sockets, etc
Gregg Title: Re: Tube rectifier in OTS - possible?? Post by: Bluestone on May 04, 2012, 07:57:08 AM I think you will find medium to high gain tube amps with an OD circuit don`t employ tube rectification.
Older/vintage low wattage amps used tube rectifiers, but i`m sure anything with an OD channel/circuit wouldn`t be best suited this. I guess the simple reason would be.. vintage amps without an OD circuit already 'sag' when pushed hard due to the inefficient power supply of the older amps. This could well be desirable if you were playing the blues through a tweed bassman, super,deluxe.. etc, but an amp with an intended OD channel needs a modern type power supply that will keep up with the demands of the amp. Cheers... Title: Re: Tube rectifier in OTS - possible?? Post by: plasticvonaband on May 05, 2012, 06:41:52 AM I think you will find medium to high gain tube amps with an OD circuit don`t employ tube rectification. Older/vintage low wattage amps used tube rectifiers, but i`m sure anything with an OD channel/circuit wouldn`t be best suited this. I guess the simple reason would be.. vintage amps without an OD circuit already 'sag' when pushed hard due to the inefficient power supply of the older amps. This could well be desirable if you were playing the blues through a tweed bassman, super,deluxe.. etc, but an amp with an intended OD channel needs a modern type power supply that will keep up with the demands of the amp. Cheers... Not entirely true. Amps with OD Channels or even cascading gain amps like the OTS can have Tube rectification. Voltage Sag has nothing at all to do with OD, even output section (PI and sometimes output tube) OD like you would get on some of the amps you mentioned. The reason most amp builders opt for diode rectification is for reliability over their tube counterparts, and also because they are looking for less sag and more touch sensitivity and fast response in their amps. An OD channel in an amp, whether it be a dedicated channel or a cascading gain type will draw very little in the way of current as 12AX7 type tubes don't draw much in the way of current, so you can indeed have a tube rectifier, or two, or as many as it takes to provide the current and voltage you need in a modern high gain amp, but again, for economy and reliabilty, most builder opt for diode solutions. Gregg Title: Re: Tube rectifier in OTS - possible?? Post by: boldaslove6789 on May 22, 2012, 03:57:24 AM Sure it can be done and has,.....
Two-Rock has done it with their Classic Type 2 or 3. Of course it will take a bit of tweaking but sure its possible. |