Unfortunately, not true for Serbia. Furthermore, they ship only using DHL, and if my order costs more than 50 EUR, DHL charges more for customs inspection
That's cool! I've found that part on Aliexpress, will order from there.
What about IPSA70R750P7S? http://www.farnell.com/datasheets/2577437.pdf
It seems to have really nice Crss, and I believe I can easily buy it locally.
Marc,
I've built one channel of the ECL86/PCL86 version of the baby huey and it's working ok but voices (when anyone says 'S') sound overstated (if that makes sense). I've tried different speakers, triode and pentode modes but it makes no difference. I'm wondering if it's the OPT'S I'm using which are Toroidy 10K push-pull for the ECL86. Any ideas that can help would be great.
Regards
Polycell
I've built one channel of the ECL86/PCL86 version of the baby huey and it's working ok but voices (when anyone says 'S') sound overstated (if that makes sense). I've tried different speakers, triode and pentode modes but it makes no difference. I'm wondering if it's the OPT'S I'm using which are Toroidy 10K push-pull for the ECL86. Any ideas that can help would be great.
Regards
Polycell
Hi aeronautical,
Better chech the group buy, run wonderfully well by Prasi. I believe he has a few boards left.
Please inquire here:
GB for Baby Huey PCB
Better chech the group buy, run wonderfully well by Prasi. I believe he has a few boards left.
Please inquire here:
GB for Baby Huey PCB
If someone is looking for the EL34 boards from the group buy. I have two boards with the parts kits for for the boards, less the transformers and case
You can email me at carlthess@yahoo.com
And I’m in the USA . If your in the UK or close . The shipping is high as one member asked about it and he did not like the cost of shipping. But shipping in the states will only be able 12.95 or less
You can email me at carlthess@yahoo.com
And I’m in the USA . If your in the UK or close . The shipping is high as one member asked about it and he did not like the cost of shipping. But shipping in the states will only be able 12.95 or less
Pcl86 Baby Huey with parallel Tubes
Hi
Since I have a few of those pcl86 tubes I thought about paralleling them, with four tubes per channel.
That would mean paralleled triode and pentode sections...
Is that a practical and good idea?
If I would do that I guess that it would be advantageous to put a bias network on every single output pentode, but I it is probably no problem to share the cathode ccs on the preamp triodes. I would have to double the current of course...
What do you guys think?
Hi
Since I have a few of those pcl86 tubes I thought about paralleling them, with four tubes per channel.
That would mean paralleled triode and pentode sections...
Is that a practical and good idea?
If I would do that I guess that it would be advantageous to put a bias network on every single output pentode, but I it is probably no problem to share the cathode ccs on the preamp triodes. I would have to double the current of course...
What do you guys think?
Hi polycell,
Sorry to have missed your post, sent more than one month ago, again
It is not an excuse but I was also on Holidays and I inform EL34 Baby Huey forum about that, but didn't check EL84 forum...
Your problem should not come from the 10k output transformer, I have used a 10k Hammond 1609 transformer without any problem, see picture May be you have some high frequency oscillations, you can check with a scope if you have one. Be sure to have well balanced input stage with about 140 to 160 V on both triodes plates.
In the future, it is better to post your questions on the EL34 Baby Huey which I am using for all subject including EL84, ECL86 and even the preamplifier
Best regards,
Marc
Sorry to have missed your post, sent more than one month ago, again
It is not an excuse but I was also on Holidays and I inform EL34 Baby Huey forum about that, but didn't check EL84 forum...
Your problem should not come from the 10k output transformer, I have used a 10k Hammond 1609 transformer without any problem, see picture
May be you have some high frequency oscillations, you can check with a scope if you have one. Be sure to have well balanced input stage with about 140 to 160 V on both triodes plates.In the future, it is better to post your questions on the EL34 Baby Huey which I am using for all subject including EL84, ECL86 and even the preamplifier
Best regards,
Marc
Attachments
Hi daemonsgr,
Yes, the line preamplifier will work perfectly at the output of a DAC, I have done it, but you cannot use it directly as a I/V converter, you must keep the existing design and plug it at the analog output port. It is not a "lampizator" Lampizator page index
Best regards,
Marc
Yes, the line preamplifier will work perfectly at the output of a DAC, I have done it, but you cannot use it directly as a I/V converter, you must keep the existing design and plug it at the analog output port. It is not a "lampizator" Lampizator page index
Best regards,
Marc
Attachments
Maybe, but is it supposed to be sounding better(except for a few more watts) than paralleled el84 or pcl86 tubes?Yes, and later on you might want to have a go at the EL34 version,
Hi daemonsgr,
Yes, the line preamplifier will work perfectly at the output of a DAC, I have done it, but you cannot use it directly as a I/V converter, you must keep the existing design and plug it at the analog output port. It is not a "lampizator" Lampizator page index
Best regards,
Marc
Yes, the line preamplifier will work perfectly at the output of a DAC, I have done it, but you cannot use it directly as a I/V converter, you must keep the existing design and plug it at the analog output port. It is not a "lampizator" Lampizator page index
Best regards,
Marc
Sorry for the double post, I made an error
Hi hop.sing,
You can find an example of a double Push-Pull with EL84 in the following schema : http://svle.free.fr/DPP-EL84/DPP-EL84-B.pdf
You can do a similar design with the ECL86, but of course two triodes will not be used... There is an interesting forum, but it is in French Audiyofan.org • Afficher le sujet - WIP - Realisation du Double PushPull d'EL84 , at least you can look at the pictures
Best regards,
Marc
Hi hop.sing,
You can find an example of a double Push-Pull with EL84 in the following schema : http://svle.free.fr/DPP-EL84/DPP-EL84-B.pdf
You can do a similar design with the ECL86, but of course two triodes will not be used... There is an interesting forum, but it is in French Audiyofan.org • Afficher le sujet - WIP - Realisation du Double PushPull d'EL84 , at least you can look at the pictures
Best regards,
Marc
Gingertube’s 6sl7/6v6 “everyday BH”
Ian,
I recently spent many, very pleasant hours reading the BH saga in preparation for my first build using the GB3 boards.
Unless I missed a later update you are listening to a 6sl7/6v6 BH most regularly at this time. If you don’t mind, I have a few questions regarding it.
1. Did you build it according to the schematic in your post #604, including the shunt feedback taken from the UL taps. If not, which schematic did you follow?
2. If yes, were any modifications to #604 needed to accomodate the 6SL7.
3. What power supply changes were made to the PS in your post #602.
4. Could you please comment on why you are using this version, rather than the EL84 BH, which you thought was more accurate, etc.
Thanks so much.
Francois
Ian,
I recently spent many, very pleasant hours reading the BH saga in preparation for my first build using the GB3 boards.
Unless I missed a later update you are listening to a 6sl7/6v6 BH most regularly at this time. If you don’t mind, I have a few questions regarding it.
1. Did you build it according to the schematic in your post #604, including the shunt feedback taken from the UL taps. If not, which schematic did you follow?
2. If yes, were any modifications to #604 needed to accomodate the 6SL7.
3. What power supply changes were made to the PS in your post #602.
4. Could you please comment on why you are using this version, rather than the EL84 BH, which you thought was more accurate, etc.
Thanks so much.
Francois
Francois,
Yes I am listening to a 6SL7/6V6 version as per post #602 with feedback from the anodes of the 6V6.
The 47K resistors from output tube anodes are 39K with the 6V6 and the cross connect feedback set resistor is IIRC 9K1 else post #602 schematic exactly.
I did try running the feedback from the UL taps as per #603 post but eventually abandoned it and reverted to the post #602 schematic.
Power Supply is as per post 604 schematic.
I'm using this version because:
1) I like it
2) The EL84 original prototypes are sitting on a shelf waiting for me to rebuild them with fixed bias and source followers.
3) No one offered me a free set of boards for the design.
I have transformer sets to suit both EL84 and EL34 versions.
BUT
Once I clear some Git Amp projects the next Stereo Amp build will be a quad of KT88 in U/L + Cathode Feedback (maybe some BH scheme too) using some Plitron VDV-2100-CFB/H Output Trannies I have had sitting on the shelf for 5 yeras or so. I also have the matching Plitron Torroidal Power Transformers.
Cheers,
Ian
Yes I am listening to a 6SL7/6V6 version as per post #602 with feedback from the anodes of the 6V6.
The 47K resistors from output tube anodes are 39K with the 6V6 and the cross connect feedback set resistor is IIRC 9K1 else post #602 schematic exactly.
I did try running the feedback from the UL taps as per #603 post but eventually abandoned it and reverted to the post #602 schematic.
Power Supply is as per post 604 schematic.
I'm using this version because:
1) I like it
2) The EL84 original prototypes are sitting on a shelf waiting for me to rebuild them with fixed bias and source followers.
3) No one offered me a free set of boards for the design.
I have transformer sets to suit both EL84 and EL34 versions.
BUT
Once I clear some Git Amp projects the next Stereo Amp build will be a quad of KT88 in U/L + Cathode Feedback (maybe some BH scheme too) using some Plitron VDV-2100-CFB/H Output Trannies I have had sitting on the shelf for 5 yeras or so. I also have the matching Plitron Torroidal Power Transformers.
Cheers,
Ian
Last edited:
Thank you for the speedy reply. One last question. Did you abandon the UL tap FB scheme because the BH sounded better with FB from the anodes?
Thanks again for the learning experience you provided me, and many others in the BH thread over many years. I wish you enough spare time and great success with your next Amp endeavour. It would be wonderful to follow that when you get to it.
Kind regards,
Francois