if i said yes... my fiance would leave me without a doubt! and to be frank, shes good looking, me not so much.... so better keep her.
Wise choice!
I will give it a go myself, PCB layouts are done, now i just need to get some parts sorted!
Are you using the gingertube PS?
I will give it a go myself, PCB layouts are done, now i just need to get some parts sorted!
Are you using the gingertube PS?
nope. I went with 6uf obbligato film, 193 hammond choke, 220uf 500v electrolytic (bypassed with 1uf obbligato - but have since taken them out, didnt notice any difference!) and i think i used a hammond 372hx (if i remeber correctly...). Play around in psud II to change the voltage of B+ by messing with the input cap. I am running at 340v b+, so run the el84s at 34ma (by using 18 ohms in the bias blocks instead of the 16 ohms).
that brings me in just below the max dissapation.
that brings me in just below the max dissapation.
with my **** KEF Q5s, which are about 90db efficiency, its louder than i would ever listen too, controls the bass superbly. amazing upgrade from my old solid state.
I tried it with my dads whardale 9.1's (84 db) and it lacked a bit of power.
I tried it with my dads whardale 9.1's (84 db) and it lacked a bit of power.
Hmm i was going to pick up some Tannoy F1's for £70 to have in the bedroom with the baby huey, but only 87db efficiency.
I would really really love to get this project going, now just to find some money, time and patience to get started.
Any chance of the quick sketch of your PS, i previously declined? 😱 .
I would really really love to get this project going, now just to find some money, time and patience to get started.
Any chance of the quick sketch of your PS, i previously declined? 😱 .
Just out of curiosity, what factors would make a tube newbie choose the Baby Huey over the Red Light District (or vice-versa) other than output power differences, which are marginal?
Wodgy said:
I would guess ease of construction and complexity. If you look at the PS for the RLD you will see it is quite a bit more complicated.
An externally hosted image should be here but it was not working when we last tested it.
I changed the 470 to 220uf, the 288v transformer should be 275. I also used stealth diodes (like hexfreds - smooth switching).
bear in mind that psud works to a point, then tolerances of your components kick in and you may have to tweak.
Wodgy said:
The baby huey is wired as ultralinear and the red light district is wired as pentode (hence the power difference).
If you happen to have 8K output transformers that lacked UL taps then the RLD would be a good choice.
I run the BH as a modded Rogers Cadet, as I said, and the O/P trafos are the original 8K with no ultralinear taps - still amazing sound and plenty loud enough for 87dB sensitive speakers (Rogers LS 3/5As)
Hi,
Rogers LS 3/5 is famous for being tube friendly. so please be rational.
IMHO, BH can tame Single fullrange speakers >= 88db very well. or anything with gradual impedance curve.
But then again, you can't have everything in reality, since "not too expensive" is one of your requirements, ~10Watt/ch is about the best compromise IMHO.
BH in penthode mode is still very nice IMHO.
I use hole saw with a power drill to cut chassis holes upto 20mm.
BH uses LTP as split phase which has the best CMRR of all topology, can tolerate a lesser PSU. RLD uses Cortina, a lot is required at the PSU and quite a bit of work with ~100pc of LED.
Would you care to share your PCB layout?
Cheers
Ken
Rogers LS 3/5 is famous for being tube friendly. so please be rational.
IMHO, BH can tame Single fullrange speakers >= 88db very well. or anything with gradual impedance curve.
But then again, you can't have everything in reality, since "not too expensive" is one of your requirements, ~10Watt/ch is about the best compromise IMHO.
BH in penthode mode is still very nice IMHO.
I use hole saw with a power drill to cut chassis holes upto 20mm.
BH uses LTP as split phase which has the best CMRR of all topology, can tolerate a lesser PSU. RLD uses Cortina, a lot is required at the PSU and quite a bit of work with ~100pc of LED.
Would you care to share your PCB layout?
Cheers
Ken
Ken,
I was just giving him an example of a low efficiency speaker that worked well with the BH - it has also performed well on the Jordan JX92S and ESL speakers - all without UL o/p trafo!
I was just giving him an example of a low efficiency speaker that worked well with the BH - it has also performed well on the Jordan JX92S and ESL speakers - all without UL o/p trafo!
hi jkeny,
I apologize if I offended you. I was trying to give as rational and factual recommendation as I could.
cheers
Ken
I apologize if I offended you. I was trying to give as rational and factual recommendation as I could.
cheers
Ken
Understood, Ken,
I think he won't go far wrong if he goes with the BH - it punches way above it's weight
I think he won't go far wrong if he goes with the BH - it punches way above it's weight
My camera is out of battery at the moment, but i will give it a charge and post images later on.
Is this pcb for the EL84 BH or ECL86 BH?
Ken, I've been thinking along these lines - buying a cheap but aesthetically pleasing donor amp & using it as my chassis. The chassis is always the part that takes the most time & is the most annoying/boring part for me. Chines amps probably represent the best value but the shipping to Ireland is the killer
If only my wife would allow exposed wires with lethal voltages!
Ken, I've been thinking along these lines - buying a cheap but aesthetically pleasing donor amp & using it as my chassis. The chassis is always the part that takes the most time & is the most annoying/boring part for me. Chines amps probably represent the best value but the shipping to Ireland is the killer
If only my wife would allow exposed wires with lethal voltages!
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