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B1 Xformer
B1 Xformer
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Old 25th May 2018, 07:11 PM   #1
vdi_nenna is offline vdi_nenna  United States
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Default B1 Xformer

Can we start a dialog on the B1 Xformer preamp? Does it fall under some other existing/similar design, so it's not being discussed?

From BAF 2017.
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Old 25th May 2018, 08:17 PM   #2
Zen Mod is offline Zen Mod  Serbia
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pretty much everything known about concept

so , design specifics left to talk about

I hope 6L6 (and Boyz) will soon arrange Store about Iron Pre , which will certainly Swiss Knife when speaking about modest gain preamps (both SE and Bal) , so Greedy Boyz will have more things to choose from ...... be it from Mithrandir ...... or Dwarfs around

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Old 26th May 2018, 03:10 AM   #3
woofertester is offline woofertester  United States
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I have a couple of questions

1. Is the transformer the same one used in the M2?

2. Will the 2SK246/2SJ103 work in this circuit?
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Old 26th May 2018, 08:24 AM   #4
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more musings on subject : What's wrong with the kiss,boy ?

xformer used, by memory , is same as in F6

246/103 - smaller xconductance , lesser cojones to drive xformer
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Old 26th May 2018, 02:02 PM   #5
vdi_nenna is offline vdi_nenna  United States
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In the 2017 baf presentation Mr Pass said the Cinmag transformers were used because they had slightly better performance and cost $5 less each.
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Old 26th May 2018, 06:10 PM   #6
Zen Mod is offline Zen Mod  Serbia
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for my knowledge , Edcors are way cheapest of them all , not Cinemags

just take a look on CMOQ-4 price ......... it's hardly 5$

even in case of buying them in box quantity , as Papa is doing with everything
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Old 26th May 2018, 07:07 PM   #7
vdi_nenna is offline vdi_nenna  United States
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$5 less than Jensen.
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Old 26th May 2018, 07:21 PM   #8
Zen Mod is offline Zen Mod  Serbia
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sorry , my mistake for not seeing "less"

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Old 26th May 2018, 09:02 PM   #9
twitchie is online now twitchie  Canada
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Jensen JT-123-FLPCH costs $37.78 (600/600 1:1)
according to Papa - 50% Nickel core

Specs:

Impedance ratio: 600:600
Turns ratio: 1:1
Maximum 20 Hz input: +20 dBu
THD @ 20 Hz: 0.025 %
Frequency Response: 20 - 20 KHz, -0.04 / +0.04 dB
See spec sheet for additional details


Edcor equivalent would be PC 600/600 and costs $7.23 just like any other one from that line at consumer quantities. Most definitely not close in price but relative to the total cost of building, it's not a deal breaker IMO. The problem seems to be why NP chose the Jensen for the F6 in the first place:

Taken from 6moons F6 Production article:

"Interestingly, the two transformers (M2 and F6) required different core materials to get their sounds. The M2 has an Edcor M6 steel core and the Jensen in the F6 is 50% nickel. The primary difference is that the steel has a high tolerance for saturation, the nickel alloy gives higher permeability and lower distortion at the lower levels required by the F6. It is a case of horses for courses..."
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Old 27th May 2018, 05:20 PM   #10
Nelson Pass is offline Nelson Pass  United States
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Performance aside, the Edcor does not have the separate coils needed.
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