duongmt1980,
I recom. You the first schematic, but try for good sound conect the
grids 2 and 3 to the plate - triod mode /there is mistake....grid 3 is not con. inside
to the cathode!!/. And P1 must be 2,2 - 10 kom !!!
Try to con. R17 to -U /fixed bias/ and make curent plate 80-90 ma !
/schem. 2, 3 are not for Hi-End/.
I recom. You the first schematic, but try for good sound conect the
grids 2 and 3 to the plate - triod mode /there is mistake....grid 3 is not con. inside
to the cathode!!/. And P1 must be 2,2 - 10 kom !!!
Try to con. R17 to -U /fixed bias/ and make curent plate 80-90 ma !
/schem. 2, 3 are not for Hi-End/.
hello everybody
i was gone for a while ( medical problems) but i wanna show u my tube amplifier with gu50
i have made some changes to the opt transformers: the old ones were on 14 square cm core and the new ones are on 17.28 square cm - the ressult: more bass
the green stuff it's temporarelly until i desing a face for the case
@costis_n: i'm really sorry for the inconvenince
i was gone for a while ( medical problems) but i wanna show u my tube amplifier with gu50
An externally hosted image should be here but it was not working when we last tested it.
i have made some changes to the opt transformers: the old ones were on 14 square cm core and the new ones are on 17.28 square cm - the ressult: more bass
the green stuff it's temporarelly until i desing a face for the case
@costis_n: i'm really sorry for the inconvenince
gu50
Hi Dog, I hear it is important to ground the metal top cap on these tubes. I'm designing a PP amp running gu50s in triode mode, should put out about 18 watts. Hope to have it bread boarded in the next month or so. I hear these things sound like real nice 6550s on steroids.javascript:smilie('
')
twystd
Hi Dog, I hear it is important to ground the metal top cap on these tubes. I'm designing a PP amp running gu50s in triode mode, should put out about 18 watts. Hope to have it bread boarded in the next month or so. I hear these things sound like real nice 6550s on steroids.javascript:smilie('
')twystd
Dj Dog said:
I will post photos and a schematic, but much needs to be worked out on the bread board. This is a unique phase splitter/driver section that I have not seen before, so much needs to be resolved before I feel comfortable posting a schematic. When I'm ready, I'll post to a new thread.
As far as the output transformers go, I was planning on using a pair of output transformers from old Dynaco MKIIIs. I believe (just off the top of my head) they have 4.3K plate to plate primaries, with 4,8,or16 ohm secondaries.
Colt45 said:
Well, like I said, I "heard" it was important. Before I started designing this, I researched gu50 amps from other builders. This grounding issue was mentioned twice, so thought they knew what they were talking about, apparently not.
twystd
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