Hi Marc,
I am interested in your EL84 PCB, I have 40 EL84 and I would like to use them. I can have your Gerber files.
My email: fafon53@gmail.com
I am interested in your EL84 PCB, I have 40 EL84 and I would like to use them. I can have your Gerber files.
My email: fafon53@gmail.com
GB for EL84 BH
Hi ilorev,
I appreciate your interest, but there is currently a GB made by Prasi with very nice PCB ( GB for Baby Huey PCB ) and I think that it would be better for you and for the others to participate to this GB to help us to reach the 50 PCB needed for a good price condition, we are already at 40 boards ordered
Rgds,
Marc
Hi ilorev,
I appreciate your interest, but there is currently a GB made by Prasi with very nice PCB ( GB for Baby Huey PCB ) and I think that it would be better for you and for the others to participate to this GB to help us to reach the 50 PCB needed for a good price condition, we are already at 40 boards ordered
Rgds,
Marc
bandol83 Send me the gerber files, I will ask the price of the tiles at my supplier, my email: jasiek@falba.tech
I didn't remember to have sent the Gerber files of the new EL84 Baby Huey PCB to anyone other than Prasi, therefor I don't know from where you had these files and if they are good ones
As I have already written the first version, of which only 5 PCB were produced, had some errors...
Please check your files to be sure that they are good !
Marc
As I have already written the first version, of which only 5 PCB were produced, had some errors...
Please check your files to be sure that they are good !
Marc
Hi Polycell,
Sorry for the late answer, I have missed your question
The 1k trimmer will adjust the bias of the two input triodes and to be fully balanced the voltage of both triodes plates (pin 9) must be the same therefor you need to adjust the trimmer to have 0 VDC between the two anodes !
Some time it is easier to connect the probes to the input of C1 and C2
For your convenience I have added the last schema and PCB of the ECL86 / PCL86 Baby Huey.
Best regards,
Marc
Sorry for the late answer, I have missed your question
The 1k trimmer will adjust the bias of the two input triodes and to be fully balanced the voltage of both triodes plates (pin 9) must be the same therefor you need to adjust the trimmer to have 0 VDC between the two anodes !
Some time it is easier to connect the probes to the input of C1 and C2
For your convenience I have added the last schema and PCB of the ECL86 / PCL86 Baby Huey.
Best regards,
Marc
Attachments
Hi Polycell,
Sorry for the late answer, I have missed your question
The 1k trimmer will adjust the bias of the two input triodes and to be fully balanced the voltage of both triodes plates (pin 9) must be the same therefor you need to adjust the trimmer to have 0 VDC between the two anodes !
Some time it is easier to connect the probes to the input of C1 and C2
For your convenience I have added the last schema and PCB of the ECL86 / PCL86 Baby Huey.
Best regards,
Marc
Sorry for the late answer, I have missed your question
The 1k trimmer will adjust the bias of the two input triodes and to be fully balanced the voltage of both triodes plates (pin 9) must be the same therefor you need to adjust the trimmer to have 0 VDC between the two anodes !
Some time it is easier to connect the probes to the input of C1 and C2
For your convenience I have added the last schema and PCB of the ECL86 / PCL86 Baby Huey.
Best regards,
Marc
Loaded question aside, what you are asking for is sufficiently different enough that you may wish to start a separate thread, as that's a different enough design that it doesn't really belong here. This is a pretty well laid out design that becomes something else entirely when doing what you propose.
The PCBs were purchased through Group buys - unfortunately one just concluded. The kind organizer (Prasi) of the GB has some EL34 boards left, but the EL84 boards are all spoken for. Perhaps folks who bought multiple boards would be willing to sell you a pair. The GB price per pair was around US$30.
See post #792:
GB for Baby Huey PCB
Regarding your transformers - hopefully the experts could advise you better, but if it were me I would sell those and get a pair of UL transformers. (Why change a proven design into something else by using different transformers?)
See post #792:
GB for Baby Huey PCB
Regarding your transformers - hopefully the experts could advise you better, but if it were me I would sell those and get a pair of UL transformers. (Why change a proven design into something else by using different transformers?)
Hi snapper,
You don't need an EL84 board because the 4k primary transformer will be perfect for the EL34 Baby Huey PCB and you are lucky, there are still some available in the GB
Second good news : you don't need to change anythings on the PCB, you just need to connect the screen to the plate (triode mode) or to the high voltage (pentode mode), it work perfectly, I have done it, see photos
You can also read posts 2071, 73, 74 and 75 about this subject EL84 Amp - Baby Huey
There is also a lot of informations here : EL34 Baby Huey Amplifier
Rgds,
Marc
You don't need an EL84 board because the 4k primary transformer will be perfect for the EL34 Baby Huey PCB and you are lucky, there are still some available in the GB
Second good news : you don't need to change anythings on the PCB, you just need to connect the screen to the plate (triode mode) or to the high voltage (pentode mode), it work perfectly, I have done it, see photos
You can also read posts 2071, 73, 74 and 75 about this subject EL84 Amp - Baby Huey
There is also a lot of informations here : EL34 Baby Huey Amplifier
Rgds,
Marc
Attachments
Hi snapper,
Yes, you can use a switch or jumper because you must not change it when power is on
Hi rankot,
If you cannot find STU9HN65M2 in stock at MOUSER : STU9HN65M2 STMicroelectronics | Mouser France you can use other MOSFET with low Crss like the FQFP2N60C as suggested in the BOM
I would not recommend IRF740 because of its high Crss !
Marc
Yes, you can use a switch or jumper because you must not change it when power is on
Hi rankot,
If you cannot find STU9HN65M2 in stock at MOUSER : STU9HN65M2 STMicroelectronics | Mouser France you can use other MOSFET with low Crss like the FQFP2N60C as suggested in the BOM
I would not recommend IRF740 because of its high Crss !
Marc
