"In case it was not obvious from the description, this is an output transformerless solution."
understatement of the century
whats electricity? ;-)
Seroiusly, im no electrician, so a modification like that on ANY amp is a little beyond my reach....
cheers anyway
understatement of the century
whats electricity? ;-)
Seroiusly, im no electrician, so a modification like that on ANY amp is a little beyond my reach....
cheers anyway
No big loss. You would be dissipating something along the lines of 3kW/ch in heat while idling, and drawing several amperes from a supply of some 200V+ is nowhere near safe without some serious protection measures.
Would be interesting if someone ever did such a thing, though.
Would be interesting if someone ever did such a thing, though.
angel said:Would be interesting if someone ever did such a thing, though.
And this isn't? 😱 http://www.diyaudio.com/forums/showthread.php?postid=307487#post307487
Tim
The 1970's Ampeg SVT bass amp uses 6 output tubes (I don't recall what) and around 600-700v power supply for a solid, reliable 300w output. If you can find someone who really knows transformers, you could build on their design (parallel tubes for more power without HV supplies). The SVT is forced-air cooled, and barely portable. I bet you could get 600-800 watts before crossing the line between unwieldy and ridiculous.
On the other hand, you could try renting two of these from a big music rental place, and see if they do the job. A cheap experiment compared to building something this big.
On the other hand, you could try renting two of these from a big music rental place, and see if they do the job. A cheap experiment compared to building something this big.
How about building a pair of bridgeable stereo 100W/ch amplifiers using 4 6550's or KT88's per amp? Then you can bridge the 4 ohm taps for 200W/amplifier. Reasonably good availability for all parts.
Btw, doesn't Hammond have a 280 Watt rated output transformer meant for three pair of beam pentodes? If so, you could order four & potentially reach your original stated goal using bridging in a single chassis!
Btw, doesn't Hammond have a 280 Watt rated output transformer meant for three pair of beam pentodes? If so, you could order four & potentially reach your original stated goal using bridging in a single chassis!
Hi,
Is it OK to bridge at the 4ohm taps and run 8ohm speakers? If it is thats such a sweet idea for mine!! (basically williamson, pp kt88) What do you do about the input to each channel? Just feed the split the signal into 2 and run dirrect into both? a 1:1:1 interstage transformer maybe? Hmmm.....😎
Steve
Is it OK to bridge at the 4ohm taps and run 8ohm speakers? If it is thats such a sweet idea for mine!! (basically williamson, pp kt88) What do you do about the input to each channel? Just feed the split the signal into 2 and run dirrect into both? a 1:1:1 interstage transformer maybe? Hmmm.....😎
Steve
If only for the purpose of PA (abbreviation for public announcement, I guess), I figure some China-made sceond-hand 805 push and pull machine may satisfy your demand. One or two of these racked giants even can handle 1000w output power. But if you require Hi-Fi, drop this idea.
Are you still interested in large valve amplifiers?
Reason; I am considering resurecting my 1960's 500w design which used ten x KT88s as a bass guitar/Hi-fi amplifier
Reason; I am considering resurecting my 1960's 500w design which used ten x KT88s as a bass guitar/Hi-fi amplifier
- Status
- Not open for further replies.