Updating my revibe.

[Mike_J]

About 20 years ago I decided a revibe should be next on my project list. Built it and it hummed. A very nice gentleman by the name of Tore-T took on the task of trying to help me. I tortured the poor man with my ignorance. He had every right to say you poor dumb SOB you are never going to get it but he didn't. Nice guy throughout and the revibe ended up being quiet.


Have attached a couple of pictures of the interior of the revibe chassis and my old nemesis the power cord strain relief. An IEC jack is definitely going in this one and hopefully better running of AC wiring. Miracle it ever got quiet.


Anyway, the revibe had a tube go bad and I was never very impressed with the sound the vibrato contributed so it has been on the shelf for quite some time. I am sure I am not the first person to express this comment. While the current Hoffman layout looks very much like what I built there are some components that are different. This may have already been dealt with.


Waiting on parts for the 5f6a rebuild that are supposed to be here on Wednesday so I have a few days to devote to this. The ecaps are pushing 20 years old and with a few small movements of components and the addition of a few turrets I should be able to get some radials in with relative ease. Then the waiting game will start over again. Will be glad when Hoffman starts stocking them so I can get them promptly.

[Mike_J]

The popular thing to do for a short while was to run a wire soldered to the back of the pots. Not a good idea. The buss bar connected to the grounds on the pots is a much better idea. Will be buying new pots from Doug to fix this hideous mess.


Another thing I am pretty sure I am noticing is there are two capacitors connected to A and none connected to B+. That's not right but might have been the solution to curing the noise.

[EL34]

All that Tore-T info is on the library page under my Re-vibe section

[Mike_J]

All that Tore-T info is on the library page under my Re-vibe section

I was afraid of that. Out of many moments that were not my best that one is up there pretty high.

[Mike_J]

Gave some thought to placement of new radial ecaps to clean up my Revibe. It has been many years since I made it and almost as many since it was used. A picture of their proposed placement and grounding spot on the buss bar is attached.


Will require the movement of the PT1, PT2 and bridge rectifier back but that isn't a big deal. Small movement in other components like the dropping resistors will be done as well. This board is quite a bit thinner than the current 1/8" board but looking at how much the backs of the turrets are flared the same turrets I am using now were probably used then. Any comments would be appreciated.


The 47uF @ 500VDC that are called for in two places don't seem necessary to me. Seems illogical we would have a 350VDC B+ cap and drop the voltage down through a 10K/3W dropping resistor and need a 500VDC cap. Sounds like a product availability issue to me. If I use 47uF and 100uF @ 350VDC and 22uF @ 500VDC then I am using the exact same values I used to recap my 5f6a rebuild. If Doug were to decide to stock those values I would gladly wait until he got them in stock to get them. Would probably get them sooner than I am getting parts from my current supplier of radial ecaps. I would probably also order the 47uF @ 100VDC caps for the heater DC supply circuit. They are dirt cheap and you wouldn't want to have someone go to another supplier to buy their parts for one cheap little cap. There is a significant price drop if you order 50 or 100 units of these parts and I would be willing to pay a reasonable amount more to buy them from Doug because of his good service and the value the forum provides. Any individual that does not have an amp building business would not want to purchase 50 or 100 units of ecaps because it might take them a long time, if ever, to use them but someone who sells these parts for a living could easily clear 50 or 100 units in a reasonable period of time.


Apologize if it seems like I am trying to tell anyone how to run their business. Want to try to send more business his way.