MPX/PPX Slam vs. non-slam
Mar 22, 2006 at 10:47 PM Thread Starter Post #1 of 25

guynamedjohn

100+ Head-Fier
Joined
Mar 10, 2006
Posts
128
Likes
0
Can someone tell me what the "slam" configuration refers to in the Singlepower amps. I understand that is a different combination of tubes, but what does that mean precisely? How is the sound affected?

Cheers.
 
Mar 22, 2006 at 10:54 PM Post #2 of 25

EdipisReks

Banned
Joined
Jul 29, 2004
Posts
4,608
Likes
13
the Slams have 5687s in the output stage. these tubes allow higher current levels, and sound more dynamic and "slammier" than tubes like the 6SN7 and 6CG7. the Slams usually have a 6SN7 or 6CG7 for input.
 
Mar 22, 2006 at 10:58 PM Post #3 of 25

guynamedjohn

100+ Head-Fier
Joined
Mar 10, 2006
Posts
128
Likes
0
Which would be a warmer sounding configuration?
 
Mar 23, 2006 at 12:25 AM Post #4 of 25
Joined
Nov 4, 2003
Posts
607
Likes
35
The slam will give you a fuller, richer sound. Some may describe it as warmer. To my ears, the non-slam just sounds leaner by comparison. Mind you, it's still good-sounding, but especially on my Grados, the slam tubes sound much better.

You can really affect the sound of the PPX3 a lot via tube selection. So far, my favorite driver tube is a 7N7, which is warm and full as well (and my favorite output tubes are the 5687s).
 
Mar 23, 2006 at 12:39 AM Post #5 of 25

guynamedjohn

100+ Head-Fier
Joined
Mar 10, 2006
Posts
128
Likes
0
Thanks! Sounds like the slam is what I want then. Oh, my aching wallet.
biggrin.gif
 
Mar 23, 2006 at 2:09 AM Post #6 of 25

BrianS

500+ Head-Fier
Joined
Jan 6, 2004
Posts
868
Likes
10
i am jealous
rolleyes.gif
i have an old school all 6cg7 mpx3
 
Mar 23, 2006 at 2:13 AM Post #7 of 25

PFKMan23

Headphoneus Supremus
Joined
Dec 31, 2004
Posts
3,349
Likes
12
I don't have 5687s, but I do have some nice 6BL7GTs on my amp right now and I can say it's quite open and impactful.
smily_headphones1.gif
 
Mar 23, 2006 at 3:15 AM Post #8 of 25

nmculbreth

100+ Head-Fier
Joined
Jan 11, 2005
Posts
271
Likes
10
In my experience the difference between the Slam and the non-Slam configuration has more to do with the presentation than coloration. As other have said the Slam configuration has a more upfront and dynamic sound and the standard 6SN7 configuration sounds a bit more airy with more depth in the soundstage.
 
Mar 23, 2006 at 3:25 AM Post #9 of 25

BrianS

500+ Head-Fier
Joined
Jan 6, 2004
Posts
868
Likes
10
Quote:

Originally Posted by nmculbreth
In my experience the difference between the Slam and the non-Slam configuration has more to do with the presentation than coloration. As other have said the Slam configuration has a more upfront and dynamic sound and the standard 6SN7 configuration sounds a bit more airy with more depth in the soundstage.


how much are slam adapters? i have 3 6CG7 version
 
Mar 23, 2006 at 3:35 AM Post #10 of 25

nmculbreth

100+ Head-Fier
Joined
Jan 11, 2005
Posts
271
Likes
10
Quote:

Originally Posted by BrianS
how much are slam adapters? i have 3 6CG7 version


I believe I paid $100 per adapter. I should mention that the adapters are for octal bases and wouldn't work for amps with the 6CG7.
 
Mar 23, 2006 at 3:45 AM Post #11 of 25

BrianS

500+ Head-Fier
Joined
Jan 6, 2004
Posts
868
Likes
10
ok thanks.

i could always save up and mikhail could convert my amp to 6sn7 or slam i think
evil_smiley.gif
 
Mar 23, 2006 at 9:37 AM Post #12 of 25

tom hankins

Headphoneus Supremus
Joined
Mar 13, 2003
Posts
5,730
Likes
14
The slam amps also have a dial on the front of them that allow you to adjust the amount of feedback you want with the amp. This in combo with the 5687 output tubes is what makes the difference between the stock and slam amps.
 
Mar 23, 2006 at 6:07 PM Post #13 of 25

BrianS

500+ Head-Fier
Joined
Jan 6, 2004
Posts
868
Likes
10
yeah i forgot about that. i guess a mpx3 6cg7 converted to slam would be rather expensive relatively
 
Mar 23, 2006 at 7:27 PM Post #14 of 25

nmculbreth

100+ Head-Fier
Joined
Jan 11, 2005
Posts
271
Likes
10
Quote:

Originally Posted by tom hankins
The slam amps also have a dial on the front of them that allow you to adjust the amount of feedback you want with the amp. This in combo with the 5687 output tubes is what makes the difference between the stock and slam amps.


I was under the impression only the PPX3 Slam had the feedback knob.
 
Mar 23, 2006 at 7:30 PM Post #15 of 25

PFKMan23

Headphoneus Supremus
Joined
Dec 31, 2004
Posts
3,349
Likes
12
Quote:

Originally Posted by nmculbreth
I was under the impression only the PPX3 Slam had the feedback knob.


As a standard part of the modification the PPX3 SLAM has this. The MPX3 SLAM has this as an option. You can also request it on any SP amp if you so wish, as an optin as well.
 

Users who are viewing this thread

Top