Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: ernie_jr on March 29, 2015, 08:16:41 am

Title: Output P/T suggestion
Post by: ernie_jr on March 29, 2015, 08:16:41 am

Building a bass amp, based off SUNN but will be in pentode mode. 560 volts on plates, Which would be a better o/p tranny Hammond 1650R (100watt, 5000 ohm) of 1650n (60watt, 4300 ohm).
thanks,
Ernie

Title: Re: Output P/T suggestion
Post by: Willabe on March 29, 2015, 09:06:41 am

What power tubes and how many?


            Brad     :icon_biggrin:

Title: Re: Output P/T suggestion
Post by: ernie_jr on March 29, 2015, 09:26:11 am

2x KT 88,
thanks

Title: Re: Output P/T suggestion
Post by: shooter on March 29, 2015, 11:32:50 am

The data sheet I have shows 4-5k at 560vdc.  I'm working out kinks in a Kt88/6550/EL34 with 430v plate and I'm using a 4K OT.  I would think the higher wattage would heat up less, or not saturate as soon, which I believe keeps thing "tighter" sounding?

Title: Re: Output P/T suggestion
Post by: clyde on March 29, 2015, 02:20:47 pm

I've used the 1650R at 600+ plate volts with success.  The amp in question gigs continuously and has for 9 years. 

Title: Re: Output P/T suggestion
Post by: DummyLoad on March 29, 2015, 06:51:42 pm

for PT:
http://triodeelectronics.com/mq782.html (http://triodeelectronics.com/mq782.html)
http://www.hammondmfg.com/pdf/EDB378X.pdf (http://www.hammondmfg.com/pdf/EDB378X.pdf)
https://edcorusa.com/xpwr149 (https://edcorusa.com/xpwr149)




for OT:
http://triodeelectronics.com/a4dyoutr43oh.html (http://triodeelectronics.com/a4dyoutr43oh.html)
https://www.hammfg.com/files/parts/pdf/1650RA.pdf (https://www.hammfg.com/files/parts/pdf/1650RA.pdf)
https://edcorusa.com/cxpp100-ms-5k (https://edcorusa.com/cxpp100-ms-5k)