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Re: LL1660 / 10mA with 46 driver.

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In Reply to: LL1660 / 10mA with 46 driver. posted by PeterP on May 10, 2004 at 19:23:27:

What you suggest might be adequate and since you already have the transformers, probably bears trying.
However, I would be tempted to think about an LL1660 connection (reversed Alt. T, but requires the 40mA version of the LL1660; or Alt. Q with the primary coils in parallel, requires at least 10mA version of LL1660)with step down to push the 211 into A2. It may be that you can't extract enough swing out of a 46 under these circumstances, but the ability to deliver grid current will be enhanced substantially by the 2:1 (approximately) step down. Perhaps it isn't to your taste, but a Sovtek 2A3 will field a pretty high plate voltage, has substantially lower plate impedance than a triode-connected 46, and sounds pretty good. This will help.

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Re: LL1660 / 10mA with 46 driver. - PeterP 16:37:26 05/11/04 (2)
So then a LL1677/80mA with a 300b or 2A3 might be a better choice? I'll have to give that some carefull consideration. I intend to try the 76-46 and probably 6EM7 with the LL1660/10mA just to see. I don't expect that I'll even get the chance to try anything 'till summer which, in my case, means that this will be a winter project.
Just never seems to be enough time.
Thanks for the input.
Pete.
- Re: LL1660 / 10mA with 46 driver. - KevinC 05:43:30 05/13/04 (1)
  No, the LL1677 is a step-up transformer made to provide the high level voltage drive required by the 845. The 211 is a different animal. It needs less drive voltage, but to do A2, requires low drive impedance, hence my step-down suggestion.
  - Re: LL1660 / 10mA with 46 driver. - PeterP 13:13:55 05/13/04 (0)
    I was thinking of using it reversed as a 2:1 stepdown. Perhaps that is not a good choise? In any case I'll be playing with the LL1660/10mA first.
    Thanks for the input.
    Pete.

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