Recent content by beaurawls

If the squealing is with no input cable in the input jack, the problem is in the amp and a pedal cannot help.

The self feedback or squealing with no input is common in early Boogies. This I confirmed with Mike B. yesterday. Normally the onset of this is at high ie. 5-9, settings. This can change drastically with different 12AX7's. Have high quality spares and experiment. The stereo footswitch jacks...

Have an experienced tech show you how different bias levels affect the tone of your amp, have it set from cold to hot as you play through it and observe the tone changes, they are very noticable. Try this and you will be suprised at what your ears tell you. Boogie's need their bias set just as...

From the IIB owners manual: Also located beneath the chassis is a stereo socket for the optional Dual Footswitch. This will be wired to activate, when applicable, the Graphic EQ and Reverb. When an amplifier is built with only Reverb or Graphic, a mono 1/4” guitar jack is mounted for use with...

Geobull, Under NO circumstance try to set bias by a voltage reading of bias voltage. Bias can ONLY be set by measureing, either directly or indirectly,the plate current. Output tubes have a designated plate power dissipation, The plate dle current in milliamperes times the plate voltage...

gts, do you know he plate current in each output? Is yours also simul class ?

Thanks JVK, as gts stated, very nice and much appreciated. Best Regards, beaurawls 8) :D :D :D :) and :o

At last, Mk IIc documentation The Battle Rages on... Basic tracks recorded at Bearsville Studios in New York City with vocals and overdubs recorded at Red Rooster Studios in Tutzing (Germany) and Greg Rike Studios in Orlando, Florida. Engineered by Bill Kennedy, Mike Reiter, Hans Gemperle and...

See how it all comes together.... Deep Purple Studio Albums LINE-UP ALBUM TITLE Mk I Shades of Deep Purple, September 1968 (UK) The Book of Taliesyn, December 1968 (US), July 1969 (UK) Deep Purple, June 1969 (US), November 1969 (UK) Mk IIa Deep Purple in Rock, June 1970 (UK) Fireball, May...

The whole thing: Its too late To fall in love with sharon tate But its too soon To ask me for the words I want carved on my tomb So I think its time that you all start To think about gettin by But what about that need to go out and find somebody to love Its too late Theres no one left that I...

Since you replaced the outputs, you must check and probably adjust the bias. If your bias is such that the output tube idle current is less than it should be, the amp will break up earlier and have less power out. Regards, beaurawls

Is there a chart for different levels of Mark vs number of posts? Regards, beaurawls 8)

Has anyone else tried this? The bias divider must be altered to provide 55 ma in each tube. Output increases to a conservative 125 watts rms out into 8 ohms. The amp becomes much more sensitive and sweeter lead sustain. Also opening up the power supply with 40mfd instead of 220mfd makes it...

I have found out that replacing the output tubes with 8417's and rebiasing gives a much less harsh sound and 125 watts rms output. Regards, beaurawls 8)

What is the Russ barrier?