skal1
Well-known member
nice one this will be my third attempt on this psu if this don't work i am going point to point old schoolcheers
skal1
the Poor Man 660 support thread
- Thread starter [silent:arts]
- Start date
Help Support GroupDIY Audio Forum:
nice one this will be my third attempt on this psu if this don't work i am going point to point old schoolcheers
skal1
analag said:
R1 should be 10W 50R - 100R and R2 2W 150K - 75K depending on your situation. Tweak the values so that you have 310V - 320V going into the regulator under full load meaning when the tubes are conducting/working or whatever you wanna call it.
hello still having problem with the high voltage rail
with the analag mod both channel connected all tube voltage reach 245v than start floating from 210 to 190??? ???
can see the meters moving with the voltage floating
if i use just one channel it work and sounds great
do not matter which channel i use... but just une chanell...
so my idea is to build a second psu for the other channel maybe a semplified version without all the small trnstrs
just the high voltage rail (245+136)v
build the 245vpsu rail like the 136v rail on the schematic it is possible?
radiance
Well-known member
dingo said:
Maybe start with another toroid just for the second heater....Since you're using the slow start heater boards you'll have to do this anyway.
The toroid you have now is not able to power both slow start heater boards.
Also, AFAIK apart from the heater secondaries this toroid is perfectly capable to power two channels.
hello radiance
my slow start heater have is own transformer 100va 9v(lot of juice) both slow start have sep. bridge rect. not using rondo 9v section
transf any more .
same with relays lamp and scamp booster have separate power supply pcb with 24v (m-nats one )and dedicated transformer
the rondo is just driving +17v -17v and the high voltage(245 136 v)
so is just the high voltage failure !! :-\
my slow start heater have is own transformer 100va 9v(lot of juice) both slow start have sep. bridge rect. not using rondo 9v section
transf any more .
same with relays lamp and scamp booster have separate power supply pcb with 24v (m-nats one )and dedicated transformer
the rondo is just driving +17v -17v and the high voltage(245 136 v)
so is just the high voltage failure !! :-\
radiance
Well-known member
dingo said:
Sorry, I did not know that....
radiance
Well-known member
dingo said:
Have you tried powering two channels with both only one 5687 inserted? You might want to re-read Kevin's posts in this long support thread...
skal1
Well-known member
how do you solve the Ht problems
cheers
skal1
cheers
skal1
radiance
Well-known member
Yeah....what was going on there?
![[silent:arts]](https://cdn.imagearchive.com/groupdiy/data/avatars/m/0/172.jpg?1620371656){kind=avatar}
[silent:arts]
Well-known member
Great you (and Pier) sorted the problems out.
For sure we all are curious what Pier did
For sure we all are curious what Pier did
thanks Dingo, even for putting up with me on phone
if the PSU is very good is because the original schematic is very good , I have only added some components.
here there are the mods i have suggested to Dingo.
IMPORTANT: ATTENTION ! to do this modifications has risks of electric shock, fire and other very dangerous damages, I am NO responsible on this my schematic I have posted here in any case! Use this schematic at your own risk!
edit: schematic corrected
if the PSU is very good is because the original schematic is very good , I have only added some components.
here there are the mods i have suggested to Dingo.
IMPORTANT: ATTENTION ! to do this modifications has risks of electric shock, fire and other very dangerous damages, I am NO responsible on this my schematic I have posted here in any case! Use this schematic at your own risk!
edit: schematic corrected
Attachments
radiance
Well-known member
Ok, so basically Dingo contacted PPA who suggested some mods on the existing PSU after which ALL Dingo's problems were gone???
Way to go PPA!!
Way to go PPA!!
hello! radiance
yes basically have done the ppa suggested mod
on the existing psu under the pcb and now my high rail voltage are ok
have removed all the mods done before
6.3 v have separate toroidal 100va ,and scamp booster have 24v from proper psu and toroidal
yes basically have done the ppa suggested mod
on the existing psu under the pcb and now my high rail voltage are ok
have removed all the mods done before
6.3 v have separate toroidal 100va ,and scamp booster have 24v from proper psu and toroidal
Silvas
Well-known member
I just had an idea. It is possible to use another kind of tubes in the sidechain ? of course via the appropiate adapter ? i´m thinking on something that run less hot and draw less heater current from the PT...anyone has tried something like this ? Just don´t shoot me if it´s not quite a good idea !
I´m currently running my PM on 1 5687 per channel, and my PT is hot.
I´m currently running my PM on 1 5687 per channel, and my PT is hot.
Silvas
Well-known member
mich said:
Exactly !
kazper
Well-known member
Silvas said:
it's been mentioned before that if you powered the 5687 with 12V heaters over the 6.3V it would help since were paying a price to drop the voltage on that power resistor anyways. I'm also thinking that most of the power transformers are running close to there 100% rating and should have been specified larger with some breathing room.
Regarding the Tube swap:
12BH7 is not a exact replacement, which I'm sure your aware of, but if your willing to adapt you might want to kick a pair of 6N6P (Russian 6H6N tubes). The JJ ECC99 is also in the same realm. For an adapter idea check out this, but if It was me I would bush the copper with a grommet.
Take a look at the E182CC,7199 as direct pin compatible replacements that draw slightly less power.
Silvas
Well-known member
kazper said:
Good idea. This will take some work, tho. The 6bc8 (or 6n5p) will need 6.3v heaters anyway, right ?
