The Amp Garage

AFAIR, Alexander Dumble has not commented on the question of whether DLS#009 is a guitar amplifier or a bass amplifier in any interview published so far. AFAIK, some well-known manufacturers of tube amplifiers used the same power amplifiers in their contemporaneous models for bass and guitar (e.g.: ...

… As to why he used this transformer i can only guess, … https://ampgarage.com/forum/viewtopic.php?p=427296#p427296 In this interview https://ampgarage.com/forum/viewtopic.php?f=4&t=22012 Alexander Dumble explains why he started using Dynaco transformers: ... Then, Jack and I made some Dual showman...

I was told ("for bass") by someone who at the time I thought, for a variety of reasons, that he knew (as opposed to: that he assumed). Apart from that, I - as well as some other guitarists who once (about 25 years ago) had the opportunity to compare the tone and feel of DLS#009 with the tone and fee...

The block diagram I have for 121 is a machine drawn copy of the one posted above for OD-150W s/n 012. There is no s/n included on the drawing itself, only in the file name. Can anyone post what is recognized as 121's block diagram? On page 730 in the 4th edition of his book "The Tube Amp Book" Aspe...

Thanks again for your explanations. If I understand you correctly, then we have the following facts: ODS150W#0121 has an output transformer that - at least in appearance - is the same as the output transformer of DLS150W#009. According to the block diagram for ODS150#0121, the primary side of its ou...

... If this ... [Max: "this" = Winterland #003 power amp] ... is basically the Sunn/Dynaco power amp, why would it ... [Max: "it" = Dumbleland Special 150W #009 power amp] ... not be UL? For example: Perhaps because Alexander Dumble was of the opinion that Dumbleland Special 150W #009 would most cl...

... The output transformer and power transformer are quite obvious in their function ... In this block diagram, published by Aspen Pittman in the 4th edition of his book "The Tube Amp Book" on page 730 - and which, by the way, has been known in this forum for years now - the output transformer and ...

... When did he discontinue with U.L operation after the Winterland or after the D-land ... With all of Alexander Dumble's amplifiers that don't fall under the categories ODS 50W or ODS 100W, there is IMO almost no systematic and consistent and therefore predictable relationship between the respect...

Some more pictures of ODS 150W #0121: https://www.vintageguitar.com/31567/dum ... -od150-wr/

Best regards,

Max

... Are you saying that Brandon was reffering to one of those as 121? ... AFAIR Brandon‘s referring to: "the other it was around 495" = SSS150W Eric Johnson (many pictures online) "525 on the plates" = SSS150W Colin James/Kirk Hammett = copy of SSS150W SRV (special order by Colin James) Colin James...

#121 is basically an ODS preamp coupled with a SSS-style power section, ... Plate voltages in 2 SSS 150W amps: ...One of the amps … [Max: 2 x SSS150W] … (newer) had what looked to be mercury Dynaco Iron at the OT, as well as the 12AU7/12BH7 Driver setup, it also had a lower gain type preamp. It was...

#121 is basically an ODS preamp coupled with a SSS-style power section, ... ...One of the amps … [Max: 2 x SSS150W] … (newer) had what looked to be mercury Dynaco Iron at the OT, as well as the 12AU7/12BH7 Driver setup, it also had a lower gain type preamp. It was a 150W amp with 4 6550's and defin...

@Richard1001 and @rccolgan: Thank you for directing me to these pictures. Marshall also produced bass amplifiers in the 80's with 6550's with the screens on high voltage. There were two models i believe one with 4 power tubes an one with 8 6550's producing 375W RMS . ... the early Marshalls had very...

rccolgan wrote: ↑Sat Apr 24, 2021 3:53 pm ... Looking back at the gut shots of SSS #002 it appears the color bands are indeed brown-black-yellow.

Could you please post a link to these gut shots so that this 100K hypothesis can be checked against these?

Thanks and best regards,

Max

sorry, I was not aware that the Dumbleland schematic is allready known. You may have a misunderstanding about this (?): The schematic of the Dumbleland Special 150W #009 proposed by Aaron and talbany here in the first post is currently just a hypothesis that has not yet been substantiated by photog...