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half watt,metal film or carbon comp will do.

Yeah,I know,the red headed step child and all that,but I got 2 customers looking for one.I happen to think they sound great when set up right.I see none on ebay right now and I just wonder if its because nobody likes them and potential sellers think its a lost cause trying to sell one.If you got...

It is purely subjective.If you've never tried either the current production or a NOS 5751,it may be worthwhile to try a current production first before you spend the $$ for a nos.To me the current production are dull and lifeless by comparison,like a weak chinese AX7.Even a used old stock 5751...

Either of you guys ever use an 8417?I am waiting for a pair of NOS RCA 8417's to come in the mail.Looking at the data they appear to be fairly close to a 7581A,except they are capable of putting out 100 watts for a pair even tho the max ratings are 35 watts per.They'll take 660 plate volts and...

Have you guys come across many of these...

The suggested current draw,to me,is what sounds best to you and doesnt redplate.The way Mesa biases their amps is very cold,this is so when they run across tubes as described in that quote from Jay,the #3's matching the #7's ,they will be safe in the amp because at worst your tubes will still be...

I think you are looking at this inside out,kind of."So a higher plate voltage will cause the maximum current draw in mA to be lower (i.e. indirectly proportional)".Your plate voltage in a given amp will vary as you change the current draw.The plate voltage isnt "adjustable",your bias voltage or...

Off the top of my head,I think the KT88 is good for a max output of 42 watts.But that doesnt mean in any given circuit you will get 42watts.There are a lot of other factors involved.Like the plate volts,how hard the PI or driver pushes them,the OT saturating,as well as the fact that a lot of...

To determine what %MPD euro runs the tubes at you will have to put the tube in your amp and take the measurements.The plate voltage in any particular amp is not an absolute value.It will rise and fall depending on how the tubes are biased. In the 2nd calculator, it looks like Plate...

I built something like this years ago,havent used it in a long time.Do you have an ammeter?Just connect the red lead to your OT center tap and the black lead to one of the plates and you will read the actual current draw for that side of the OT.If it is a 2 tube output the reading is what that...

They all have the same pinout,but have different operating parameters.A look at a tube manual will show you the actual differences between them.In some circuits they could all be interchangeable,but in many cases they shouldnt be.For one,a true 5881 should not be used in an amp designed for a...

As for the price,if they are worth it depends on if you like them.I've seen them go for more and I've seen them go for less.Excellent tubes,nice looking examples.I use only NOS tubes and Telefunkens are some of the best,but like all NOS tubes on ebay,its a crap shoot of sorts.If you find them to...

Heres a link where you can download Jack Darrs book for free.Excelent book. www.pacificrecone.com/JackDarrBook.html

I just recently found this board and think it is great that boogie owners have a place of our own.I find it amazing how so many people on other boards knock the Boogie.I guess they never gave one a real workout. I have an original 11c+ from '83.Didnt know it was a c+ till I called Mesa with a...