Hello folks,
I've seen F5 couple years ago, back then I had decided to build it. Unfortunately due to my job I couldn't.
But recently I've started again to think about F5. After doing some research I'm confused, maybe I need to build F6?
As a person with experience building different amplifiers and electronics, I'm still not good as many people from this forum.
I need your advice in choosing right amp to drive pair of Fonken FF125wk cabinets.
Thanks!
I've seen F5 couple years ago, back then I had decided to build it. Unfortunately due to my job I couldn't.
But recently I've started again to think about F5. After doing some research I'm confused, maybe I need to build F6?
As a person with experience building different amplifiers and electronics, I'm still not good as many people from this forum.
I need your advice in choosing right amp to drive pair of Fonken FF125wk cabinets.
Thanks!
Yeah, why not actually?
Currently F6 kit is out of stock. Do you know when it will be available again?
1. OK! Thinking of building both amplifiers I'm not sure what "grade" JFETs I have to order. What Idss would be good in my case?
2. And what JFETs to get, Toshiba or Linear Systems?
Currently F6 kit is out of stock. Do you know when it will be available again?
1. OK! Thinking of building both amplifiers I'm not sure what "grade" JFETs I have to order. What Idss would be good in my case?
2. And what JFETs to get, Toshiba or Linear Systems?
They have the boards, just not the kit with boards and transformers but you can order them from Edcor yourself. I would go with the Linear matched B grade from the store. At least you will know they are not fake and they work fine. It is what I have in mine. The last I heard the kits from the store should be available soon.
Transformer on F6 is Jensen although I'm guessing Edcor probably also have a 1:1 transformer with dual primary and secondary and same pinout spacing.They have the boards, just not the kit with boards and transformers but you can order them from Edcor yourself. I would go with the Linear matched B grade from the store. At least you will know they are not fake and they work fine. It is what I have in mine. The last I heard the kits from the store should be available soon.
May as well ask store for matched jfets between 7.5mA and 8mA if they send you 10mA jfets they will self destruct on F6 (ok on F5 though)
I have both and prefer the F6.
PJN
I have both and prefer the F6.
PJN
We're talking about ordering jfets for F6
Transformer on F6 is Jensen although I'm guessing Edcor probably also have a 1:1 transformer with dual primary and secondary and same pinout spacing.
Your correct, I should have researched my purchases before writing Edcor and I have been ordering a lot from Edcor of late but I remember now that I called them to order the transformers. I filled out the form online but had to call to give the credit card number. Sorry for the confusion. You can order them direct from Jensen.
I have both and prefer the F6.
PJN
Since this post is about F-5 vs F-6 I am interested. Have F-5, my first Pass build, but am on hold with F-6 until the DIY Store gets more Chassis in. Looking forward to being able to compare my self!
Several here have built both, preference seems to be for F-6. Jfets are available from store from Linear. Spencer has matched sets of Toshiba in all reasonable idss, I just got 2 matched pairs in 7.5. Less than 40 bucks, with shipping and Pay pal.
I dont know if you get a choice of idss from store, perhaps ask on store support forum? anyone know?
Russellc
I have just upgraded my F5 to an F6
Go and have a read the in the thread I started as it may give you ideas -
It's ongoing and will update regularly with listening reviews
http://www.diyaudio.com/forums/pass-labs/278695-upgrade-f5-f6.html
FR
Go and have a read the in the thread I started as it may give you ideas -
It's ongoing and will update regularly with listening reviews
http://www.diyaudio.com/forums/pass-labs/278695-upgrade-f5-f6.html
FR
2 picoDumbs, do you mean, for both amps 7.5mA - 8mA would be good? I'm still in struggle. What Idss grade uses Mr. Pass for his commercial FW amplifiers?May as well ask store for matched jfets between 7.5mA and 8mA if they send you 10mA jfets they will self destruct on F6 (ok on F5 though)
I've sent an inquiry to Jensen.
Russellc, do you use 7.5mA for F5 or you ordered for F6?Jfets are available from store from Linear. Spencer has matched sets of Toshiba in all reasonable idss, I just got 2 matched pairs in 7.5. Less than 40 bucks, with shipping and Pay pal.
I dont know if you get a choice of idss from store, perhaps ask on store support forum? anyone know?
Russellc
Yes, I saw your thread. But, did you use the same parts from F5 including JFETs for F6?I have just upgraded my F5 to an F6
I wonder maybe use some transistor socket for JFETs to be available easily play with, e.g. compare Linear and Toshiba. But on the other side I'm not sure about contact issues. What you think?
What you mean with difference? Do you mean for both F5 and F6 amps is grade B good value?I don't think you will find much if any difference between them
P.S. Why Linear JFETs are so expensive if they have been produced recently?
2 picoDumbs, do you mean, for both amps 7.5mA - 8mA would be good? I'm still in struggle. What Idss grade uses Mr. Pass for his commercial FW amplifiers?
On F5 you can safely use Jfets with Idss up to 11mA, on F6 I wouldn't exceed 8.5mA.
Just email the store and ask for matched jfets with Idss between 7.5mA and 8mA for your F6 build.
You want the highest value Idss jfets you can get but try not to exceed half their power rating (ie try and keep it under 200mW)
Yes, I saw your thread. But, did you use the same parts from F5 including JFETs for F6?
I wonder maybe use some transistor socket for JFETs to be available easily play with, e.g. compare Linear and Toshiba. But on the other side I'm not sure about contact issues. What you think?
For my build I used new F6 PCB boards with new parts but reused the power section of the F5 ect
I purchased the PCB boards with Jensen Transformers also the Matched JFets, insulators from the DIY store
The matched IRFP240 transistors were purchased form Member H_A ( Hannes )
In the swap meet section just PM him and he will supply
FR
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You can order them direct from Jensen.
If I remember right, the pinouts are different. The DIY board is correct for the Jensens.
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What you mean with difference? Do you mean for both F5 and F6 amps is grade B good value?
P.S. Why Linear JFETs are so expensive if they have been produced recently?
I mean no difference in sound between them
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