hammond transformers?

[ipop07]

I posted this on another forum as well hoping to get some information in time for my project due date. I am not sure if this is the right place to ask this but I am hoping that if its not you guys can lead me in the right direction at least. I am working on a project and i was wondering what are the amps that hammond transformers work in as drop in replacements or upgrades with little or no mods...Thank you very much anticipated.


peace&love

[Gluca]

Many amps. I belive that more info on that amp would allow someone to direct you to the right choice.

Ciao
Gianluca

[ipop07]

there is no specific amp, but i was asking what do people buy from hammond and put it in an amp and it works fine....what tranny in what amp

[DigitalJunkie]

It depends on the output tubes used (primary impedance) and power level. Ohh,and topology-You can't use a SE transformer in a PP amp,and vice-versa.

[AuroraB]

I'm no tube expert at design level, but as Junkie says, the design of the amp dictates what kind of transformer to use. Hammond makes transformers to suit most of the common classic combinations of PP output tubes, like EL34s, KT66s, 77s and 88s, 6550s, EL84s etc. etc. Pinpointing specific amps is a major task and will make a very long list! Forget about McIntosh, though, - most of them use special transformers.

[kstagger]

I buy Hammond PTs and Chokes almost exclusively for my amplifiers. Are the best? Maybe not, but if one of them ever goes south, a replacement is just a click away.

I've used various output iron (Audio Note, One Electron, Electraprint) and haven't used any of Hammond's iron until now. I'm using the 1627SEA in my latest amplifier project - so far I've been very pleased for the money.

[Miles Prower]

Originally posted by ipop07
there is no specific amp, but i was asking what do people buy from hammond and put it in an amp and it works fine....what tranny in what amp

I designed a project based on PP 807s, and used a Hammond 1650H. This is rated at 30W, 6K6ct (PRI), 4-8-16 (SEC). It promised f(l)= 20Hz and f(h)= 30KHz, and that's what I measured open loop. Sure, may not the the "best", but then, again, Hammonds don't cost what Lundahl, Magnequest, &c cost. I got somewhat better performance from a NOS Stancore OPT, but that one was a 4K4ct primary, so not really a fair comparison.

The straight PP OPTs (no ultralinear taps) work just great. Can't vouch for other Hammond xfmrs, and I have heard that they have been having difficulties with their SE OPTs (wonkey frequency behaviours) and UL OPTs (miswired primaries).

Take your pick: YMMV.

[Ty_Bower]

Originally posted by ipop07
I am working on a project and i was wondering what are the amps that hammond transformers work in as drop in replacements or upgrades with little or no mods...

Tell us more about your project, and maybe we can better answer your question. You ask which amps will accept a Hammond transformer, but you have no specific amp or Hammond transformer in mind. This is a diy forum - I'd expect that there are lots of "Hammond compatible" amplifiers built by the forum members. I've got a 6L6/EL34/KT88 single ended amp with a Hammond power transformer, and I've also built a push-pull EL84 amp with Hammond outputs. Would they count? The Hammonds weren't really "drop in replacements" - the Hammonds were the original transformers the amps had from the day they were built.

[Bandersnatch]

hey-Hey!!!,
I've found the 1650R 5k/100W to be an exceptional model. It works for a lot of the usual audio valves, with a little attention to B+ to fit the load line properly.
cheers,
Douglas

[wg_ski]

So what B+ would you recommend, with the 1650R's and KT88's? I have a pair of the trannies and some KT88's gathering dust that could be resurrected this winter.