| Electronics > Projects, Designs, and Technical Stuff |
| Tube amp questions |
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| Gyro:
I know what you mean. Supply isn't that much of an issue though - China bought up the tooling and still makes them as the FU50. I suspect that their military might still use them, probably not quite of the same quality though. EDIT: Germany started the whole ball rolling with the Telefunken LS50 during WWII, then the Russians captured some... https://en.wikipedia.org/wiki/GU-50 |
| sahko123:
thanks for bringing these up but ive not much money to spend on this(High school student with fuck-all else to do with his spare time besides EE projects) its mostly going to the power and audio transformers along with some passives like resistors capacitors depending on what I do and don't have. I've wanted to do a project like this a while but didn't want to spend too much on good tubes so I was waiting for cheaper used tubes. Then the opportunity arrived and I bought them they are 6 sovtek 6550s and 6 jj 6550s. The same seller has preamp tubes that im also thinking of buying.(12ax7's) This all depends on the design I go for. Im designing the amp more so around these tubes with necessary additions or other thinks I might find that I would like to include. But if you have anything to suggest to a tube virgin then feel free. ive been doing solid state stuff for years and have wanted a bigger challenge. |
| Gyro:
--- Quote ---The same seller has preamp tubes that im also thinking of buying.(12ax7's) --- End quote --- If short of money, then also check out 6n1p-ev and 6n2p-ev (preferably Voskhod), again rugged mil spec and superior but slightly different heater connections to the 12ax7 - 6.3V heater connection only, with pin for internal shield. EDIT: ... but from the prices you're quoting, it sounds as if you'll get a decent price anyway. |
| spec:
--- Quote from: T3sl4co1l on November 05, 2018, 06:06:42 pm --- --- Quote from: spec on November 05, 2018, 05:21:02 pm ---If you are interested in the off-line switch-mode PSU approach, I can post a schematic of one of the designs I did a few months ago, which may give you a few ideas. --- End quote --- I'm a bit interested (maybe put it in another thread) -- does that come with winding details of the transformer, and EMC test results? Theory says (and backed up by my own measurements) that high voltage outputs are that much harder to pull off cleanly than low voltage (where you only have the primary's voltage and ringing to deal with). --- End quote --- Not sure why you ask about winding details, but no, they are not provided. Never had any problem with noise. You can get as smooth as you like by adding local CR filtering any way. Don't forget that OLSMPSUs are everywhere. My Teck scope even has an OLSMPSU, and every light bulb in the house has an OLSMPSU- I know because when the glass bulb fails I salvage the components. :) |
| spec:
--- Quote from: sahko123 on November 05, 2018, 06:11:32 pm ---as for the Offline switch mode PSU I'm not even sure where to start I'm not sure what they really are. I understand what switch mode supplies are but are these ones specifically for powering vacuum tube circuits or other high voltage DC electronics? --- End quote --- No, OLSMPSUs are not specifically for valve amps. I will see if I can post some information about OLSMPSUs. |
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