Very nice, your build is far better than anything I have seen in a long time. Components are perfectly spaced above the board. I hope it provides many years of enjoyment.
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This is from the EL34 thread. The EL34 board has a higher bias voltage. Hence the higher value of R16. I'm thinking 15K is fine for the EL84 board with it's lower bias voltages.
On the BOM. You might want to check the WIKI where some updated resistor values are...to be safer regarding possible oscillations.
Baby Huey PP EL84 amplifier
I'll put them here also:
"R14 and R15 changed from 270R 2W to 1K 2W, past experience showed that EL34 in Ultralinear need 1K" ...often 1k is also used as screen stopper for EL84...ymmv.
"I didn't change R3 and R4 but if I had thought about them before loading I would have used 4K7 for just a bit more ECC83 parasitic oscillation proofing."
Baby Huey PP EL84 amplifier
I'll put them here also:
"R14 and R15 changed from 270R 2W to 1K 2W, past experience showed that EL34 in Ultralinear need 1K" ...often 1k is also used as screen stopper for EL84...ymmv.
"I didn't change R3 and R4 but if I had thought about them before loading I would have used 4K7 for just a bit more ECC83 parasitic oscillation proofing."
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Thank you, Bas, for your posts on your build. Very helpful. I also noticed that you have already updated the BHEL84 WIKI with gingertubes suggestions he wrote just a few hours ago! Wow. Thanks for doing the WIKI also.
I’m looking forward to hearing your listening notes and observations on the performance of your BHEL84, especially compared to your Broskie “Uncommonly good EL84” amplifier.
I’m looking forward to hearing your listening notes and observations on the performance of your BHEL84, especially compared to your Broskie “Uncommonly good EL84” amplifier.
You are welcome Francois. I'm a very frustrated man by the way...regarding listening etc....as I'm missing an output tranformer....its somewhere....
first world problems.
first world problems.
Hello Guys!
I have seen many Chinese kits and cadmium-iron clamp pcb connectors are also widely used in diyers.
How do these chandelier connectors come with your hi-fi ???
When gold-plated cables, sockets are a hit, is such an internal (practical 🙁 ) connector OK ???
I have seen many Chinese kits and cadmium-iron clamp pcb connectors are also widely used in diyers.
How do these chandelier connectors come with your hi-fi ???
When gold-plated cables, sockets are a hit, is such an internal (practical 🙁 ) connector OK ???
I don't care for fancy cables. But I'll probably end up soldering signal in directly to the board. But power supply in for power.. Bias.. 6.3 in etc.. Even output transformer.. I'm fine with connectors.
Baby and even more electron tube amplifiers have been made by me for years.
I haven’t finished one yet, but the classic Baby is in line. My hobby poisoned me. 🙂
I'm poor, I can't buy an output transformer. I have to make it.
I haven’t finished one yet, but the classic Baby is in line. My hobby poisoned me. 🙂
I'm poor, I can't buy an output transformer. I have to make it.
Attachments
I found mine being used in the kitchen, being used as ballast on a pudding bowl for some Korean thing with cabbage in it.
In fact, according to my partner, this is an undocumented benefit of toroidal OPTs over traditional types. Something about the low centre of gravity and the wipe-clean black plastic tape ;-/