Hello Prasi,
This is a good remark
Yes, the Power Supply MK2 could be a nice addition to the Group Buy, but 1 module is enough for a stereo set. It does not need to be produced in 2.4 mm thick and it is only 10 x 10 cm, therefor it should not cost a lot if people want to buy it at PCBWay or JLCPCB but to get everything together may be simpler
I will make a diagram of the wiring, this PCB has been optimized for the Toroidy 250 VA transformer...
Cheers,
Marc
This is a good remark
Yes, the Power Supply MK2 could be a nice addition to the Group Buy, but 1 module is enough for a stereo set. It does not need to be produced in 2.4 mm thick and it is only 10 x 10 cm, therefor it should not cost a lot if people want to buy it at PCBWay or JLCPCB but to get everything together may be simpler
I will make a diagram of the wiring, this PCB has been optimized for the Toroidy 250 VA transformer...
Cheers,
Marc
Hi,
I made the wiring diagram (I am not a specialist of computer drawing) and you will see that the wiring is straight forward compared to the previous version
Ciao,
Marc
I made the wiring diagram (I am not a specialist of computer drawing
) and you will see that the wiring is straight forward compared to the previous version Ciao,
Marc
Attachments
This is my first tube amp ever and I love it. Need to finish some minor details... Many thanks to Bandol83, gingertube, prasi...for their work and devotion
https://www.diyaudio.com/forums/tubes-valves/71300-photo-gallery-906.html#post5854182
Need to finish some minor details... Many thanks to Bandol83, gingertube, prasi...for their work and devotion https://www.diyaudio.com/forums/tubes-valves/71300-photo-gallery-906.html#post5854182
This is my first tube amp ever and I love it.
https://www.diyaudio.com/forums/tubes-valves/71300-photo-gallery-906.html#post5854182
That's a terrific build, love the front panel and metal work... Congratulations potepuh!
Hello Prasi,
This is a good remark
Hello Marc,
Ok. If you are ordering through pcbway, you can share the design there and create an order link so that with just a click, it would be possible for people to place the order for PSU PCBs
OR else
If all GB subscribers are agreeing , then I will produce the PSU PCBs also. I will then consider every GB subscription as 2 PCBs of MK2 and 1 PCB of PSU.
Regards
Prasi
Hi Ian,
I am a little surprised by your remark about the fact that no one offered you a set of boards for the EL34 Baby Huey ! About one year ago, I offered you a set of boards from the first GB and told you that the following GB were done by Prasi, but I didn't hear from you since that time ? I can still send you one spare set of the first GB if you want, or may be Prasi will be pleased to send you a set of the MK2 version offered by all DIYer's who are building this nice amplifier based on your design and thanks you for your good help
I have already send boards to several members who helped me on DIYaudio forum including Hugh Dean (AKSA), Prasi, Eric Fortier, Olivier (Project16), Philippe (pvphil), etc... I have no problem to do that, please send me your address by mail.
I send you also the latest revision of the Quad TENA / Baby Huey schematic since you helped me to make corrections on it. I have continued to check it since that time and will be testing it when I will have more free time. You can find the actual version in this post. I will probably replace the ECC82 by an ECC99 as suggested in your April 30, 2018 mail...
Cheers,
Marc
I am a little surprised by your remark about the fact that no one offered you a set of boards for the EL34 Baby Huey ! About one year ago, I offered you a set of boards from the first GB and told you that the following GB were done by Prasi, but I didn't hear from you since that time ? I can still send you one spare set of the first GB if you want, or may be Prasi will be pleased to send you a set of the MK2 version offered by all DIYer's who are building this nice amplifier based on your design and thanks you for your good help
I have already send boards to several members who helped me on DIYaudio forum including Hugh Dean (AKSA), Prasi, Eric Fortier, Olivier (Project16), Philippe (pvphil), etc... I have no problem to do that, please send me your address by mail.
I send you also the latest revision of the Quad TENA / Baby Huey schematic since you helped me to make corrections on it. I have continued to check it since that time and will be testing it when I will have more free time. You can find the actual version in this post. I will probably replace the ECC82 by an ECC99 as suggested in your April 30, 2018 mail...
Cheers,
Marc
Attachments
Hello Ian,
Sorry, it never crossed my mind to include you in the GB as I thought you had the amp already done.
I do not have any PCBs from the earlier GB's.
I would be happy to gift you a pair of MK2 and PSU as posted by Marc. You will love the PCBs from India I am sure.
I am sure, everyone here is grateful for the contributions you made and the smiles it brought once they had it singing.
Regards
Prasi
P.S. Done! added your name in the list.
GB for Baby Huey PCB
Sorry, it never crossed my mind to include you in the GB as I thought you had the amp already done.
I do not have any PCBs from the earlier GB's.
I would be happy to gift you a pair of MK2 and PSU as posted by Marc. You will love the PCBs from India I am sure
.I am sure, everyone here is grateful for the contributions you made and the smiles it brought once they had it singing.
Regards
Prasi
P.S. Done! added your name in the list.
GB for Baby Huey PCB
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Hello,
This little word just to say that my PP equipped with 6CA7 works perfectly for several months. It's totally silent, there is no hum, the dynamics at low volume is excellent.
When I turn up the volume it animates without difficulty the 30 cms of my JBL-L65 Jubal and the music is very beautiful. Many thanks to Marc, Ginger and Prasi for this great amp.
The evolutions of the MK2 proposed by Marc will simplify the wiring and integrate the filtering modification of the HT (see my post # 291). It's a very good thing.
This Baby amplifier is a total success. It will stay in my main set surely for a long time.
Have a good day,
This little word just to say that my PP equipped with 6CA7 works perfectly for several months.
It's totally silent, there is no hum, the dynamics at low volume is excellent. When I turn up the volume it animates without difficulty the 30 cms of my JBL-L65 Jubal and the music is very beautiful. Many thanks to Marc, Ginger and Prasi for this great amp.
The evolutions of the MK2 proposed by Marc will simplify the wiring and integrate the filtering modification of the HT (see my post # 291). It's a very good thing. This Baby amplifier is a total success. It will stay in my main set surely for a long time.
Have a good day,
Attachments
Last edited:
I am proposing to use the MKII boards with Hammond 1650NA (Raa 4K3) and some Winged C Svetlana EL34 I have in my "stash". Then see if there are any other improvements I can find.
Alternately, I have some Hammond 1650P (Raa 6K6) which I could use with some Gold Lion reissue KT88 if that would be of more interest. As the thread is EL34 BH I lean toward the first option. I also have KT77 I can try in it.
If I go with the 1650P output trannies then the alternate to KT88 is KT66. (which I have too).
Not sure if I have stated it on this forum or not - for those of you who are EL84 Fans but want more "wick" then I can say that from my experience (well my opinion anyway), the BIG tube which most closely sounds like EL84s in push pull is NOT EL34 as you might expect but rather KT88.
The BH (despite all the wonderful things said about it above) does grunge up a bit when pushed hard. I would like to see if there is anything I can do about that.(And try it as the power section of a Guitar Amp).
Cheers,
Ian
Alternately, I have some Hammond 1650P (Raa 6K6) which I could use with some Gold Lion reissue KT88 if that would be of more interest. As the thread is EL34 BH I lean toward the first option. I also have KT77 I can try in it.
If I go with the 1650P output trannies then the alternate to KT88 is KT66. (which I have too).
Not sure if I have stated it on this forum or not - for those of you who are EL84 Fans but want more "wick" then I can say that from my experience (well my opinion anyway), the BIG tube which most closely sounds like EL84s in push pull is NOT EL34 as you might expect but rather KT88.
The BH (despite all the wonderful things said about it above) does grunge up a bit when pushed hard. I would like to see if there is anything I can do about that.(And try it as the power section of a Guitar Amp).
Cheers,
Ian
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Hi all,
Before to send the Gerber files to Prasi, I wanted to test the Power Supply for the Baby Huey MK2
Beside the error of the capacitors of the negative power supply that I found during the assembly I didn't found any other wiring mistake bur only a serigraph error on the high voltage output connector where GND and +400 V were on the wrong side
With the 275 VAC transformer output (I have only 450 VDC capacitors) I have about 435 VDC on the high voltage output without load.
With the 50 VAC I have -135 VDC voltage output without load.
The two 6.3 VAC 7A in serial give about 15 VDC to drive the DC/DC converter to generate 6.3 VDC for heaters.
The other 6.3 VAC 2A is used to generate the +15 VDC for the drivers and the 12 V regulator for the timer...
Cheers,
Marc
Before to send the Gerber files to Prasi, I wanted to test the Power Supply for the Baby Huey MK2
Beside the error of the capacitors of the negative power supply that I found during the assembly I didn't found any other wiring mistake bur only a serigraph error on the high voltage output connector where GND and +400 V were on the wrong side
With the 275 VAC transformer output (I have only 450 VDC capacitors) I have about 435 VDC on the high voltage output without load.
With the 50 VAC I have -135 VDC voltage output without load.
The two 6.3 VAC 7A in serial give about 15 VDC to drive the DC/DC converter to generate 6.3 VDC for heaters.
The other 6.3 VAC 2A is used to generate the +15 VDC for the drivers and the 12 V regulator for the timer...
Cheers,
Marc
Attachments
Hi,
I made the wiring diagram (I am not a specialist of computer drawing
Ciao,
Marc
Hello Marc,
A member enquired if the PSU will be suitable for EL84 also?
Can you please confirm?
regards
Prasi
Hello Prasi,
Of course this PSU will be suitable for the EL84 Baby Huey with the right voltage value
In fact this Power Supply can be used with almost every tube amplifier with the following characteristics :
1) a high voltage filtered and delayed by a timer up to 500 VDC (340 VAC input max) with the right capacitors (for EL84 I will recommend 350 V)
2) a negative bias power supply up to -150 VDC (60 VAC input max) adjusted by R2 & R3 and regulated by the MOSFET transistor
3) a 15 VDC (with 2 x 6,3 VAC input) to drive a DC/DC converter to generate 6.3 VDC heater supply
4) an auxiliary +15 VDC to eventually power the MOSFET driver and a 12 V regulator for the timer logic
Regarding the timer, I have to check the value because I noticed that there was no delay, the green LED (power on with high voltage through a 10k resistor) turn on immediately, this is normal, but the red LED (high voltage fully on direct) is also on immediately which is not what I expected
If you find an error let me know please
Ciao,
Marc
Of course this PSU will be suitable for the EL84 Baby Huey with the right voltage value
In fact this Power Supply can be used with almost every tube amplifier with the following characteristics :
1) a high voltage filtered and delayed by a timer up to 500 VDC (340 VAC input max) with the right capacitors (for EL84 I will recommend 350 V)
2) a negative bias power supply up to -150 VDC (60 VAC input max) adjusted by R2 & R3 and regulated by the MOSFET transistor
3) a 15 VDC (with 2 x 6,3 VAC input) to drive a DC/DC converter to generate 6.3 VDC heater supply
4) an auxiliary +15 VDC to eventually power the MOSFET driver and a 12 V regulator for the timer logic
Regarding the timer, I have to check the value because I noticed that there was no delay, the green LED (power on with high voltage through a 10k resistor) turn on immediately, this is normal, but the red LED (high voltage fully on direct) is also on immediately which is not what I expected
If you find an error let me know please
Ciao,
Marc
OK , the relay arrived today as scheduled and I immediately tested it, and... it work The delay is 30 seconds which I think is enough to give the time to the tube heaters to warm up !
In fact the GND was connected to pin 1, but it was nod GND1 I had to connect them together, this will be modified on the final version but it is not critical anyway since all GND are connected together on the amplifier PCB
Bye,
Marc
The delay is 30 seconds which I think is enough to give the time to the tube heaters to warm up !In fact the GND was connected to pin 1, but it was nod GND1
I had to connect them together, this will be modified on the final version but it is not critical anyway since all GND are connected together on the amplifier PCB Bye,
Marc
