Old design but I have a few 807's in the shed 😀
How critical is the 6k primary on the OPT's ??? Edcor do the CXSE25-8-6.5K (EDCOR - CXSE25-8-6.5K) would this be close enough??
What have other DIYers used??
Cheers
How critical is the 6k primary on the OPT's ??? Edcor do the CXSE25-8-6.5K (EDCOR - CXSE25-8-6.5K) would this be close enough??
What have other DIYers used??
Cheers
It is not that critical. For 6L6 (which 807 also is) the recommended load resistance varies from 2k5 to 6k.
The plate voltage with 6k5 should be some 450 V to get optimum results.
Then the screen voltage should be limited to 200...250 V.
If only some 300 V is available as +Ub, then the load resistance should not be more than 4k5.
The plate voltage with 6k5 should be some 450 V to get optimum results.
Then the screen voltage should be limited to 200...250 V.
If only some 300 V is available as +Ub, then the load resistance should not be more than 4k5.
Thanks
B+ is likely to be just under the 350v in the design.
Will look at this one,
15W, single ended tube output transformer for 3.5K Ohms to 8 Ohms.
GXSE15-8-3.5K
EDCOR - GXSE15-8-3.5K
B+ is likely to be just under the 350v in the design.
Will look at this one,
15W, single ended tube output transformer for 3.5K Ohms to 8 Ohms.
GXSE15-8-3.5K
EDCOR - GXSE15-8-3.5K
I have used Edcor's GXSE 15 W series transformers with 15 W 811A SE with excellent results,
but obviously CXSE 25 should be even better, but it is essentially more expensive.
The reason for this is not the amount of iron, but the amount of copper and other things.
but obviously CXSE 25 should be even better, but it is essentially more expensive.
The reason for this is not the amount of iron, but the amount of copper and other things.
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