nielsk
Well-known member
I'd like to get one as well.....how do we go about it?????
drip V72 pcb
- Thread starter dripelectronics
- Start date
Help Support GroupDIY Audio Forum:
zachs
Well-known member
Sourcing all my parts still, got a few questions on some of the things, perhaps you can help me out.
1) VU Meter, you say same as LA-2A but I can find the model, newb.
2) X Position Screw Terminals - Where's the best place to get these, do you have part numbers for all 3 types?
3) 100k Ohm Pots w/ Audio Taper - Part number anywhere?
4) Both types of wire you specify, where's an easy place online?
5) Lastly do you have any finished photos of the guts in a case?
I think aside from those few things I've got everything else already, just waiting for Mouser to arrive. I've got all my Lundahls and the Allied stuff came yesterday.
Cost so far:
Still missing a few things, case, meter, pots, and some random stuff but here it is.
Drip v72 PCB – $100
Lundahl LL1667 – $105
Lundahl 1636 – $83
Lundahl 1578XL – $84
Mouser Parts – $120
Allied Parts – $30
EF-86 Tubes – $40~
Total $562
1) VU Meter, you say same as LA-2A but I can find the model, newb.
2) X Position Screw Terminals - Where's the best place to get these, do you have part numbers for all 3 types?
3) 100k Ohm Pots w/ Audio Taper - Part number anywhere?
4) Both types of wire you specify, where's an easy place online?
5) Lastly do you have any finished photos of the guts in a case?
I think aside from those few things I've got everything else already, just waiting for Mouser to arrive. I've got all my Lundahls and the Allied stuff came yesterday.
Cost so far:
Still missing a few things, case, meter, pots, and some random stuff but here it is.
Drip v72 PCB – $100
Lundahl LL1667 – $105
Lundahl 1636 – $83
Lundahl 1578XL – $84
Mouser Parts – $120
Allied Parts – $30
EF-86 Tubes – $40~
Total $562
dripelectronics
Well-known member
perfect !
ill go down that list in the morning ,
600 bucks seems right .
i have all the regulated power pcb ready to go to print
going regulated needs a transformer 350v (no center tap) @ 40mA /sdecondary of 12.0v@ 2 amps ct /
plus a spare secondary for 55 volts for phantom . (not sure of the correct amp rating of the filiment)
any idea would be great.
as of now i would use a 180-0-180 with 6.3v for the lamp .
then a separate enclosed filimet transformer for the 12.6 v @ 2 amps.
cant seem to find a transformer with all this built in ,
custom jobs are a possibility.
on the vu mete , it is not essential for use ,
but does help with a visualization of the signal
going out .
g.
ill go down that list in the morning ,
600 bucks seems right .
i have all the regulated power pcb ready to go to print
going regulated needs a transformer 350v (no center tap) @ 40mA /sdecondary of 12.0v@ 2 amps ct /
plus a spare secondary for 55 volts for phantom . (not sure of the correct amp rating of the filiment)
any idea would be great.
as of now i would use a 180-0-180 with 6.3v for the lamp .
then a separate enclosed filimet transformer for the 12.6 v @ 2 amps.
cant seem to find a transformer with all this built in ,
custom jobs are a possibility.
on the vu mete , it is not essential for use ,
but does help with a visualization of the signal
going out .
g.
Gabriel Sousa
Well-known member
i have a vintage siemens v72,
has anyone compare, make an A/B test ??
great clone job !!!
has anyone compare, make an A/B test ??
great clone job !!!
thehazardharke
Active member
for the vu meter go to http://www.meterdistributor.com/ and look for "SIFAM METERS" It's the AL29WF model, same as the drip LA2A. They're located in california and good on delivery.
Thanks,
Charlie
Thanks,
Charlie
thehazardharke
Active member
The VU meter is about $60.00 USD without the light box, the light box is $20.00 USD.
You can find the 100k pots at any electronic distributor. I got mine @ mouser.
You can find the 100k pots at any electronic distributor. I got mine @ mouser.
Gabriel Sousa
Well-known member
" combined some of the features of the v72 , v72s , v78 circuits "
what feature of v72s and v78 has ?
what feature of v72s and v78 has ?
dripelectronics
Well-known member
thank you guava for that transformer !!!
ill print the regulated board very soon .
as time and money permit.
mr sousa ,
ill have to write a small document on the routing
of the pcb , but many parts of it can be by passed or re-routed .
as for a/b test
im very happy with the side by side comparisons
with a pair of siemens v72's .
if you bypass the pot and go with a fixed feedback resistor ,
it gets even closer .
i also wired up a unit with ef-804s and the original siemens transformers .
a/b was very close .
there is a little more bass with the original transformers , but just a smidgen.
IMHO : the pcb is layed out in an very effiicent manner.
the caps alone can be 50$ of beautifly sounding electrolytics powing a set of 20$ hex freds
going in to state of the art mumetal encased lundahll transformers .
.1% resistors /silver mica caps . 93" thick pcb board .
the pcb gives you the options to pimp your 72 off the charts.
im listening to a track of music being reamped into my mixer one side using the original choke
and the other using the lundahl choke .
it's just so subjective.
but as soo as i csn get a guitarist in here , ill lay down some a/b tracks.
g.
ill print the regulated board very soon .
as time and money permit.
mr sousa ,
ill have to write a small document on the routing
of the pcb , but many parts of it can be by passed or re-routed .
as for a/b test
im very happy with the side by side comparisons
with a pair of siemens v72's .
if you bypass the pot and go with a fixed feedback resistor ,
it gets even closer .
i also wired up a unit with ef-804s and the original siemens transformers .
a/b was very close .
there is a little more bass with the original transformers , but just a smidgen.
IMHO : the pcb is layed out in an very effiicent manner.
the caps alone can be 50$ of beautifly sounding electrolytics powing a set of 20$ hex freds
going in to state of the art mumetal encased lundahll transformers .
.1% resistors /silver mica caps . 93" thick pcb board .
the pcb gives you the options to pimp your 72 off the charts.
im listening to a track of music being reamped into my mixer one side using the original choke
and the other using the lundahl choke .
it's just so subjective.
but as soo as i csn get a guitarist in here , ill lay down some a/b tracks.
g.
zachs
Well-known member
Anyone else in the building phase yet? I just got all my mouser parts and have pretty much all the basic on-board stuff in. I still need to order pots and all the stuff for the wiring but have the rest I think. Gonna swap out the 2x 10ufs and go with 4 (or 5) of the 40ufs.
bradb
Well-known member
also,
Curious about the sowter choke too..
what about a compare between the sowter and the lundahl chokes?
Does the exposed sowter choke pick up too much noise?
Will the regulated board give us the option of deleting the expensive Atoms for filtering in a trade off for a more expensive power transformer?
There are so many options here!!
Curious about the sowter choke too..
what about a compare between the sowter and the lundahl chokes?
Does the exposed sowter choke pick up too much noise?
Will the regulated board give us the option of deleting the expensive Atoms for filtering in a trade off for a more expensive power transformer?
There are so many options here!!
Gabriel Sousa
Well-known member
dripelectronics ,
can i post your DIY, on my portuguese forum ???
thanks
can i post your DIY, on my portuguese forum ???
thanks
zachs
Well-known member
Brad: You can use 4x 10ufs and that will save you a little bit. I think I'm going to opt for the 4x 40ufs.
dripelectronics
Well-known member
mr sousa ,
sure , you can link the thread !
as for options to the atoms , just buy el-cheapo axial zicons.
their a couple of bucks each , and they fit fine.
atoms are half the charm , heh .
im experiencing no problems with the open choke and noise .
thanks for the edcor note , their located in my state .
i should try them .
g.
sure , you can link the thread !
as for options to the atoms , just buy el-cheapo axial zicons.
their a couple of bucks each , and they fit fine.atoms are half the charm , heh .
im experiencing no problems with the open choke and noise .
thanks for the edcor note , their located in my state .
i should try them .
g.
bradb
Well-known member
thanks guys and greg!
Hi
I used to have a few v72 and some v76.- I personally think the special (magic bla bla) of the V7X series is the tx.
I could imagine oliver archut builts quite good replacement txs for the series, I guess it's not cheap.
I had to sell them all because I was blank... totally overprized anyway like most of the vintage stuff. Now I'm most of the time recording with PGA2500 in my prismsound orpheus and I never had so good sounding recordings.
I just put something up myspace. http://www.myspace.com/telebossa btw first track the voice is recorded with a Brauner VM1 second track with a DIY mic using EF732 and Dale"s M7... the tx is not perfect (t14/1) wrong ratio bass is lacking but it allready sounds good
nicholas
I used to have a few v72 and some v76.- I personally think the special (magic bla bla) of the V7X series is the tx.
I could imagine oliver archut builts quite good replacement txs for the series, I guess it's not cheap.
I had to sell them all because I was blank... totally overprized anyway like most of the vintage stuff. Now I'm most of the time recording with PGA2500 in my prismsound orpheus and I never had so good sounding recordings.
I just put something up myspace. http://www.myspace.com/telebossa btw first track the voice is recorded with a Brauner VM1 second track with a DIY mic using EF732 and Dale"s M7... the tx is not perfect (t14/1) wrong ratio bass is lacking but it allready sounds good
nicholas
thehazardharke
Active member
Hey greg,
Would the Lundahl LL9206 input transformer work instead of the LL1636? As far as I know its the same thing, except there isn't any shielding around it.
Would there be an issue?
Charlie
Would the Lundahl LL9206 input transformer work instead of the LL1636? As far as I know its the same thing, except there isn't any shielding around it.
Would there be an issue?
Charlie
