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Post by jyrki3101 on Dec 16, 2021 8:01:00 GMT
Hi, I'm building a tube tape echo and I'm planning to use the Vox long tom circuit with just one instrument input.I have the tape transport system copied from a Pearl echo orbit 302 unit and have almost all parts for that. Tape bias oscillator is based on Dynacord echocord S65 because I have a few original transformers for that 12au7 push pull oscillator.
Could I have a schematic and a layout for that Vox unit.I'm not sure how to organize the circuit on tagboards. For example , the grounding scheme must be quite critical and what amplification stages(playback-,rec.stage, input-and output) to put on each tagboard.I have only built basic tube amps and other effects so far. I could also use the oscillator circuit from the Long tom echo but unfortunately I don't have that wearite? coil for that. I would greatly appreciate your help ! With Kind Regards, Mr Jyrki Telila
My email is : jyrki.telila@gmail.com
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Post by jyrki3101 on Aug 19, 2019 10:56:05 GMT
I decided to try my luck with this hydra delay and possibly try to tweak it's frequency response to match it with the old units.... I have tried to find a schematic for the Vox Long Tom echo but haven't succeeded..... Could someone help me with that , or give me some useful info on voicing the pedal to sound like the old ones ? With Kind Regards, Jyrki Telila
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Post by jyrki3101 on Mar 30, 2017 23:50:16 GMT
I've had some marvellous help and support from you Charlie!, and Derek from H&C ! About the grounding issue that you mentioned,hasn't anybody else been "suffering"with same kind of symptoms? Why the grounding problem was in my unit only ? BUT AFTER ALL: I'm a very happy fellow now , playing my strat to the HCSE and a DIY ac15 ! What a wonderful echo unit I would say !I used an Amtech AGE-1 for 10 years but now I can't live without the HCSE,seriously.....! Thank you for your support ! With Kind Regards, Jyrki
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Post by jyrki3101 on Mar 30, 2017 18:22:55 GMT
Hi Charlie , I sent my HCSE unit for repair(hum issue) last Friday and now I had it back. It was sent back the SAME day it was delivered there on Wilton Road ! Amazing support I would say ! I plugged in my unit to mains and to my vox ac 15(diy) amp . no HUM !!! Because I'm a realistic , I'd like to know at least something about the source of the hum noise please ? With Kind Regards, Jyrki
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Post by jyrki3101 on Mar 30, 2017 18:21:24 GMT
Hi Charlie , I sent my HCSE unit for repair(hum issue) last Friday and now I had it back. It was sent back the SAME day it was delivered there on Wilton Road ! Amazing support I would say ! I plugged in my unit to mains and to my vox ac 15(diy) amp . no HUM !!! Because I'm a realistic , I'd like to know at least something about the source of the hum noise please ? With Kind Regards, Jyrki
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Post by jyrki3101 on Mar 21, 2017 9:22:39 GMT
Hi Charlie, thank you for all your help, I really appreciate that ! I'll contact the support next ! Regards, Jyrki
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Post by jyrki3101 on Mar 21, 2017 5:43:06 GMT
Hi Charlie , Ok, I opened the casing this morning and when looking at the bottom view, on the left side of the board, there's one thick wire from the nut to a ground pad next to the output "molex"connector and from that ground pad another wire goes right next to the power connector on the pcb board, which looks like it is the "ground plane"connection . No wire or wires from the other nut ! Regards, Jyrki
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Post by jyrki3101 on Mar 20, 2017 20:45:11 GMT
Hi Charlie, I purchased the unit as new from the first or second batch I think, in late 2015.....not sure cause I don't have the receipt at the moment, the serial number is 219 ! Regards, Jyrki
Oh..., and my mains power is 3 wire(230V /50Hz)
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Post by jyrki3101 on Mar 20, 2017 20:13:38 GMT
Hi Charlie, Yes the inner pair of wires from the power socket to the pcb is still neatly routed close to the chassis , away from the pcb and the rest of the components. The hum goes away when I disconnect the power adaptor from the HCSE .
Regards, Jyrki
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Post by jyrki3101 on Mar 20, 2017 19:46:27 GMT
I already did that with 3 different amps, just the HCSE:s output connected to any amp(tweed deluxe,ac15,blues junior),same problem,also with guitar connected to HCSE input. With my pedalboard the hum gets worse because I use a compressor AFTER the HCSE ! Mo matter what combination of equipment, the hum is still there....,the electrician that helped me today by trying fix the problem (by insulating the power socket) was interested of knowing how all the power filtering is done on the HCSE, he said he don't see any familiar filtering components, electrolytics, rectifier diodes etc.....
Regards , Jyrki
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Post by jyrki3101 on Mar 20, 2017 19:17:44 GMT
Hi, today the power socket was totally insulated from chassis by a professional electrician .Unfortunately it didn't solve the problem. The hum gets a bit louder after I switch the effect on, there's no difference in hum level whatever patch is selected. So no double earth connection via power socket anymore but I think there never was one cause it didn't solve the problem. A ground loop or whatever is somewhere else, footswitch wiring perhaps ?, Idon't know. I'm kind of frustrated and tired now cause I really hoped that the hum would go away by making sure there is no contact to chassis on the power socket. Any suggestions ?
Kind Regards; Mr Jyrki Telilä
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Post by jyrki3101 on Mar 19, 2017 20:58:29 GMT
Thanks,Charlie for your answer . If I only had known that the paint on the device forms an insulation between chassis and the power socket , this long conversation by internet wouldn't have been neccessary ! I'm hopefull that this particular issue has been resolved !
Thankfully yours, Jyrki
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Post by jyrki3101 on Mar 19, 2017 18:56:30 GMT
Is it recommended to use a some kind of power conditioner with H&C ?
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Post by jyrki3101 on Mar 19, 2017 18:53:51 GMT
I did contact the H&C echo support via email and the suggested to send my echo to them in England to fix the problem! I decided to do that after a concert I have to do end of this month. I definitely need the unit on that gig , because the hum noise is not extremely loud I can live with that for one occasion..... I could also try to insulate the power socket temporarely with a tape or disconnect it from its chassis hole......
with best regards, Jyrki
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Post by jyrki3101 on Mar 19, 2017 18:18:18 GMT
HI Charlie, but the original power jack is of not an insulated(from chassis) type,should I replace it with an insulated one before sendin my unit to England for a fix ? Cheers,Jyrki
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Post by jyrki3101 on Mar 19, 2017 17:11:16 GMT
Hi , should the power connector on H&C unit be insulated from chassis.....I'm asking this because the hum level of the unit has increased. I did replace the straight power plug with an angled one on the power supply.It is not the cause of hum noise cause I did try that same PS with my 12Vac powered tube preamp and it was ok and no hum ! Should the two brown washers be on one or both sides of the chassis on the 2.1x5.5mm barrel jack connector....... With kind regards, Mr Jyrki Telilä
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Post by jyrki3101 on Mar 10, 2017 0:17:31 GMT
H&C echo unit !.....The ring side of the barrel style power jack(5.5mmX2.1mm) has a connection to chassis when measured by my multimeter(reading of 0,3ohm)....? I apologise my poor knowlidge in electronics but ....., in this case, when an alternating (12V) current via external power supply is being fed to the unit , I think none of the 2 wires ( line or neutral)shouldn't be connected to the chassis itself , but until it's rectified to DC and connecting to signal and power ground........
PLEASE CORRECT ME if I'am totally wrong about this matter..... I was VERY VERY happy with the H&C until this hum problem appeared....
With Kind Regards; Mr Jyrki Telila
phone 00358400470250 Finland
email : jyrki.telila@gmail.com
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Post by jyrki3101 on Feb 2, 2017 21:24:43 GMT
HI Charlie ; I-ll put the washers back but ,without a locker washer the connection will again be loose !!! How the brown" cardboard isolation washers" on the power inlet connector can provide ground isolation from the device's chassis. Should I put glue between the power connector jack and chassis to make it stable cause without a locking washer the connection will soon come loose.....! With Best Regards,'Mr Jyrki Telilä
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Post by jyrki3101 on Feb 2, 2017 18:26:01 GMT
Hi, I recently put my H&C unit to another pedalboard and decided to replace the original power connector plug(5,5x2.1mm) mith an angled one to save space on my pedalboard ! I also noticed that the original AC jack had become very loose, almost unconnected to the chassis. I had to put a locking washer inside the chassis and therefore move out the " brown cardboard or paper washers that were between the original nuts.! Could this be the reason for this 50Hz cycle hum that I'm having now Could you tell me if the"0"side of the power suplly(Your 500mA/12V /230VaC)you sent should be isolated from the chassis of H&C ?
With Kind Regards ; 'MR Jyrki Telilä email: jyrki.telilaATgmail.com
Had this buzzin problem with different equipment and it was solved with a ground connection "somewhere down the line".
Usually this goes through the AC plug on some of the connected equipment.
Just a thought
Leif PLEASE HELP ! I REALLY LOOOOVE THIS H&C ECHO and I DON*T want to put it on side ...............
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Post by jyrki3101 on Mar 3, 2016 22:46:00 GMT
Hi , I've played with H&C unit for almost a year now and I'm VERY VERY pleased with sound, I think it's better than my Amtech age-1. The ONLY annoying thing on this great pedal effect is: IT HAS NO "TAPE SPEED"( delay time)CONTROL !!!!!? WOW & FLUTTER control knob could have been replaced by speed knob, but....again, I don't design these things anyway. Another very cool replacement for my Amtech age 1 echo has been the Catalinbread Echorec-pedal BUT , that needs a 18V supply to work properly w/od pedals and the pots are a pain to get the setting right , especially the mix and speed knobs ! SO , to what conclusion have we come concerning these great little pedals . !!!! Please make them more comfortable to use in live situation ( like the old tape/disc echoes) !!!!!!! With Best Regards ; Mr Jyrki Telila
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Post by jyrki3101 on Jun 6, 2015 17:06:05 GMT
Hi Everyone, I haven't had the chance to try out this new echo with other pedals yet , so i'd like to know if any of you have had some experience.....I mean , how does it behave when driving it with OD/Dist./Booster pedals......? I've heard that it has a mosfet based preamp and they sometimes get distorted in a nasty way. I'd really like to hear some comments if anyone have tried the H&C with overdrive and etc. pedals in front of it........? Cheers, Jyrki
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Post by jyrki3101 on Nov 18, 2014 15:22:27 GMT
HI Charlie , I've already sent you a message that I will definitely buy one . Could you also add a note that I'd want to make the purchase from the first batch !
Regards , Jyrki
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Post by jyrki3101 on Aug 25, 2014 21:34:31 GMT
HI Charlie , I have already my name on the list , but I definitely want to purchase 1 unit when available !
Regards , Jyrki
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Post by jyrki3101 on May 13, 2014 0:39:06 GMT
Hi Charlie; Could you please add me to the list for your new echo unit ! The mp3 sample files I just heard sounded so marvellous... what an amazing echo you have created...it' a must have device for a guy like me cause my whole playing style is strongly based on the tape echo sound....( I've been a Hank Marvin fan since the early 80's) With Kind Regards, Jyrki
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