• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Group Purchase for CineMag Input Transformers

Status
Not open for further replies.
Jump to Latest
Steve Eddy

Steve Eddy

Member
Joined 2002
theaudioguild.com
#1
For those who would prefer to opt for the CineMag CMMI-15/15B over the more expensive Jensen JT-11P-1, the $38.26 price I gave in the Jensen thread is for 11-49 pieces. Since I could use another one, I'll buy the odd man out which means just 10 pieces for the group buy.

se


Interest shown for the CMMI-15/15B :

Dr. Strangelove3 : 2
Algar emi : 2
ble0t : 2
Steve Eddy : 2
Sy : 2
motherone : 2
Michi124 : 2
Andrew T : 6 (tentative)
Bas Horneman : 4
acliao : 2
pkpickard : 2
pekka : 2
jrd : 2
leadbelly : 2
jaap : 2


Total : 36
 
#4
I'd rather do two of these since they're cheaper 😉

BTW, is it necessary to add an op-amp gain stage onto the output side of the transformer? I've seen that in both the Cinemag and Jensen datasheets...is it just to lower the impedance?
 
#5
ble0t said:
I'd rather do two of these since they're cheaper 😉
Click to expand...

No no. Read my lips. That's "less expensive." 🙂

BTW, is it necessary to add an op-amp gain stage onto the output side of the transformer? I've seen that in both the Cinemag and Jensen datasheets...is it just to lower the impedance?
Click to expand...

No, there's no need for an opamp gain stage on the output. But it's going to have to be feeding some sort of high impedance input. How are you planning on using these?

se
 
#6
No no. Read my lips. That's "less expensive." 🙂
Click to expand...

I meant it in a monetary sense only 😉

No, there's no need for an opamp gain stage on the output. But it's going to have to be feeding some sort of high impedance input. How are you planning on using these?
Click to expand...

I was going to use them at the front end of my upcoming leach amp to allow for balanced input. I think pooge posted about some circuit modifications that would need to be made, but I can't remember where that post was...
 
#7
ble0t said:
I meant it in a monetary sense only 😉
Click to expand...

Well yeah, but "less expensive" is a monetary sense only too. 🙂

I was going to use them at the front end of my upcoming leach amp to allow for balanced input.
Click to expand...

Ah, ok.

By the way, unless you already have a balanced output you want to feed it, keep in mind that with a good input transformer, common-mode noise rejection is very high whether you're feeding it from a balanced source or an unbalanced source.

In any case, you would just use the transformer directly with the amp's input without any intervening opamp circuit.

I think pooge posted about some circuit modifications that would need to be made, but I can't remember where that post was...
Click to expand...

Can't help ya there, sorry. 🙁

se
 
#19
Hi,
what price if you can get to 50 units?
Can you estimate postage to UK?
I might go for 6 pieces to help you get there.
Can you spoonfeed me with what is required at the output stage and the input stage at either end of this transformer?
 
Status
Not open for further replies.
Top Bottom